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Network Working Group G. Roeck, Editor Request for Comments: 2128 cisco Systems Category: Standards Track March 1997 Dial Control Management Information Base using SMIv2 Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects used for managing demand access circuits, including ISDN. This document specifies a MIB module in a manner that is compliant to the SNMPv2 SMI. The set of objects is consistent with the SNMP framework and existing SNMP standards. This document is a product of the ISDN MIB working group within the Internet Engineering Task Force. Comments are solicited and should be addressed to the working group's mailing list at isdn- mib@cisco.com and/or the author. Table of Contents 1 The SNMPv2 Network Management Framework ...................... 2 1.1 Object Definitions ......................................... 2 2 Overview ..................................................... 2 2.1 Structure of MIB ........................................... 2 2.2 Relationship to the Interfaces MIB ......................... 3 2.2.1 Layering Model and Virtual Circuits ...................... 3 2.2.2 ifTestTable .............................................. 4 2.2.3 ifRcvAddressTable ........................................ 4 2.2.3.1 ifEntry for a single peer .............................. 5 2.3 Multilink and backup line support .......................... 5 2.4 Support for generic peers .................................. 5 3 Definitions .................................................. 6 3.1 Dial Control MIB ........................................... 6 4 Acknowledgments .............................................. 32 5 References ................................................... 33 Roeck Standards Track [Page 1] RFC 2128 Dial Control MIB March 1997 6 Security Considerations ...................................... 33 7 Author's Address ............................................. 34 1. The SNMPv2 Network Management Framework The SNMPv2 Network Management Framework presently consists of three major components. They are: o the SMI, described in RFC 1902 [1] - the mechanisms used for describing and naming objects for the purpose of management. o the MIB-II, STD 17, RFC 1213 [2] - the core set of managed objects for the Internet suite of protocols. o the protocol, STD 15, RFC 1157 [3] and/or RFC 1905 [4], - the protocol for accessing managed objects. The Framework permits new objects to be defined for the purpose of experimentation and evaluation. 1.1. Object Definitions Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the subset of Abstract Syntax Notation One (ASN.1) defined in the SMI. In particular, each object type is named by an OBJECT IDENTIFIER, an administratively assigned name. The object type together with an object instance serves to uniquely identify a specific instantiation of the object. For human convenience, we often use a textual string, termed the descriptor, to refer to the object type. 2. Overview 2.1. Structure of MIB Managing demand access circuits requires the following groups of information: o General configuration information. o Information to describe peer configuration and peer statistics. In this respect, peer configuration means information on how to connect to peers on outgoing calls, how to identify peers on incoming calls, and other call related configuration information. o Information to store active call information. Roeck Standards Track [Page 2] RFC 2128 Dial Control MIB March 1997 o Information to retain call history. The MIB, therefore, is structured into four groups. o The dialCtlConfiguration group is used to specify general configuration information. o The dialCtlPeer group is used to describe peer configuration and peer statistics. o The callActive group is used to store active call information. o The callHistory group is used to store call history information. These calls could be circuit switched or they could be virtual circuits. History of each and every call is stored, of successful calls as well as unsuccessful and rejected calls. An entry will be created when a call is cleared. 2.2. Relationship to the Interfaces MIB This section clarifies the relationship of this MIB to the Interfaces MIB [8]. Several areas of correlation are addressed in the following subsections. The implementor is referred to the Interfaces MIB document in order to understand the general intent of these areas. 2.2.1. Layering Model and Virtual Circuits On an occasional access channel, there are a number of peer systems that are permitted to call or be called, all of which need to be treated as active from a routing viewpoint, but most of which have no call in progress at any given time. On dialup interfaces, this is further complicated by the fact that calls to a given peer float from channel to channel. One cannot definitively say "I call this peer on that interface." It is necessary, therefore, to provide a mapping algorithm between the low-level interfaces, and the various logical interfaces supporting the peers. This is solved by creating a logical interface (ifEntry) for each peer and a logical interface (ifEntry) for each low-level interface. These are then correlated using the ifStackTable. The low-level interfaces are either physical interfaces, e.g. modem interfaces, or logical interfaces, e.g. ISDN B channels, which then in turn are layered on top of physical ISDN interfaces. Roeck Standards Track [Page 3] RFC 2128 Dial Control MIB March 1997 The model, therefore, looks something like this, taking ISDN as an example: +-------------------------------------------------------+ | Network Layer Protocol | +------+ +-------+ +-------+ +-------+ +-------+ +------+ | | | | | | | | | | <== appears active +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | PPP | | PPP | | F/R | | PPP | | F/R | | for | | for | | for | | for | | for | ifEntry with |Peer1| |Peer2| |switch |Peer3| |switch shadow PeerEntry | | | | | A | | | | B | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | | | | <== some actually are +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ | B | | B | | B | | B | | B | |channel| |channel| |channel| |channel| |channel| +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ | | | | | | | | | | +------+ +-------+ +-------+ +-------+ +-------+ +------+ | Basic/Primary Rate Interface | +-------------------------------------------------------+ Mapping of IP interfaces to Called Peers to B Channels IfEntries are maintained for each peer. In this model, each peer is required to have an associated encapsulation layer interface. This interface can be of any kind, e.g. PPP or LAPB. In order to specify the network address for a given peer, one would then usually add a routing/forwarding table entry, pointing to the encapsulation layer interface through which this peer can be reached. 2.2.2. ifTestTable The ifTestTable usage is defined in the MIBs defining the encapsulation below the network layer. For example, if PPP encapsulation is being used, the ifTestTable is defined by PPP. 2.2.3. ifRcvAddressTable The ifRcvAddressTable usage is defined in the MIBs defining the encapsulation below the network layer. For example, if PPP encapsulation is being used, the ifRcvAddressTable is defined by PPP. Roeck Standards Track [Page 4] RFC 2128 Dial Control MIB March 1997 2.2.3.1. ifEntry for a single peer IfEntries are defined in the MIBs defining the encapsulation below the network layer. For example, if PPP encapsulation is being used, the ifEntry is defined by PPP. ifEntries will never be created by the Dial Control MIB. The Dial Control MIB always depends on some other ifIndex of some set of ifTypes. That is, to create an entry in the Dial Control MIB, the base ifEntry must already have been created through some other mechanism. The Dial Control entry does have its own RowStatus, permitting the Dial Control supplementary information to come and go, but not otherwise disturbing the ifIndex to which it is attached. If in a given implementation the two are tightly bound, deleting the ifEntry may have the side effect of deleting the Dial Control entry. 2.3. Multilink and backup line support In order to support multilink and backup procedures, there may be several entries for a single peer in the dialCtlPeerCfgTable. A single peer is identified using the dialCtlPeerCfgId object of the dialCtlPeerCfgTable. There may be several entries in dialCtlPeerCfgTable with the same value of dialCtlPeerCfgId, but different ifIndex values. Each of those entries will then describe a possible connection to the same peer. Such entries can then be used to handle multilink as well as backup procedures, e.g. by bundling the attached ifEntries using PPP multilink. 2.4. Support for generic peers Generic peers can for example be supported by permitting wild-card characters (e.g., '?' or '*') in dialCtlPeerCfgAnswerAddress. A number to be accepted could then be defined as partly (e.g., '*1234') or entirely generic (e.g., '*'). A detailed specification of such a functionality is outside the scope of this document. However, the implementor should be aware that supporting generic peers may cause a security hole. The user would not know where a call is from, which could potentially allow unauthorized access. Roeck Standards Track [Page 5] RFC 2128 Dial Control MIB March 1997 3. Definitions 3.1. Dial Control MIB DIAL-CONTROL-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, NOTIFICATION-TYPE, OBJECT-TYPE, Unsigned32 FROM SNMPv2-SMI TEXTUAL-CONVENTION, DisplayString, TimeStamp, RowStatus FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF IANAifType FROM IANAifType-MIB ifOperStatus, ifIndex, InterfaceIndex, InterfaceIndexOrZero FROM IF-MIB transmission FROM RFC1213-MIB; dialControlMib MODULE-IDENTITY LAST-UPDATED "9609231544Z" -- Sep 23, 1996 ORGANIZATION "IETF ISDN Working Group" CONTACT-INFO " Guenter Roeck Postal: cisco Systems 170 West Tasman Drive San Jose, CA 95134 U.S.A. Phone: +1 408 527 3143 E-mail: groeck@cisco.com" DESCRIPTION "The MIB module to describe peer information for demand access and possibly other kinds of interfaces." ::= { transmission 21 } AbsoluteCounter32 ::= TEXTUAL-CONVENTION Roeck Standards Track [Page 6] RFC 2128 Dial Control MIB March 1997 STATUS current DESCRIPTION "Represents a Counter32-like value that starts at zero, does not decrease, and does not wrap. This may be used only in situations where wrapping is not possible or extremely unlikely. Should such a counter overflow, it locks at the maxium value of 4,294,967,295. The primary use of this type of counter is situations where a counter value is to be recorded as history and is thus no longer subject to reading for changing values." SYNTAX Unsigned32 -- Dial Control Mib objects definitions dialControlMibObjects OBJECT IDENTIFIER ::= { dialControlMib 1 } -- General configuration group dialCtlConfiguration OBJECT IDENTIFIER ::= { dialControlMibObjects 1 } -- general configuration data/parameters dialCtlAcceptMode OBJECT-TYPE SYNTAX INTEGER { acceptNone(1), acceptAll(2), acceptKnown(3) } MAX-ACCESS read-write STATUS current DESCRIPTION "The security level for acceptance of incoming calls. acceptNone(1) - incoming calls will not be accepted acceptAll(2) - incoming calls will be accepted, even if there is no matching entry in the dialCtlPeerCfgTable acceptKnown(3) - incoming calls will be accepted only if there is a matching entry in the dialCtlPeerCfgTable " ::= { dialCtlConfiguration 1 } dialCtlTrapEnable OBJECT-TYPE SYNTAX INTEGER { enabled(1), disabled(2) Roeck Standards Track [Page 7] RFC 2128 Dial Control MIB March 1997 } MAX-ACCESS read-write STATUS current DESCRIPTION "This object indicates whether dialCtlPeerCallInformation and dialCtlPeerCallSetup traps should be generated for all peers. If the value of this object is enabled(1), traps will be generated for all peers. If the value of this object is disabled(2), traps will be generated only for peers having dialCtlPeerCfgTrapEnable set to enabled(1)." DEFVAL { disabled } ::= { dialCtlConfiguration 2 } -- Peer group dialCtlPeer OBJECT IDENTIFIER ::= { dialControlMibObjects 2 } -- peer configuration table dialCtlPeerCfgTable OBJECT-TYPE SYNTAX SEQUENCE OF DialCtlPeerCfgEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The list of peers from which the managed device will accept calls or to which it will place them." ::= { dialCtlPeer 1 } dialCtlPeerCfgEntry OBJECT-TYPE SYNTAX DialCtlPeerCfgEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Configuration data for a single Peer. This entry is effectively permanent, and contains information to identify the peer, how to connect to the peer, how to identify the peer and its permissions. The value of dialCtlPeerCfgOriginateAddress must be specified before a new row in this table can become active(1). Any writeable parameters in an existing entry can be modified while the entry is active. The modification will take effect when the peer in question will be called the next time. An entry in this table can only be created if the associated ifEntry already exists." INDEX { dialCtlPeerCfgId, ifIndex } Roeck Standards Track [Page 8] RFC 2128 Dial Control MIB March 1997 ::= { dialCtlPeerCfgTable 1 } DialCtlPeerCfgEntry ::= SEQUENCE { dialCtlPeerCfgId INTEGER, dialCtlPeerCfgIfType IANAifType, dialCtlPeerCfgLowerIf InterfaceIndexOrZero, dialCtlPeerCfgOriginateAddress DisplayString, dialCtlPeerCfgAnswerAddress DisplayString, dialCtlPeerCfgSubAddress DisplayString, dialCtlPeerCfgClosedUserGroup DisplayString, dialCtlPeerCfgSpeed INTEGER, dialCtlPeerCfgInfoType INTEGER, dialCtlPeerCfgPermission INTEGER, dialCtlPeerCfgInactivityTimer INTEGER, dialCtlPeerCfgMinDuration INTEGER, dialCtlPeerCfgMaxDuration INTEGER, dialCtlPeerCfgCarrierDelay INTEGER, dialCtlPeerCfgCallRetries INTEGER, dialCtlPeerCfgRetryDelay INTEGER, dialCtlPeerCfgFailureDelay INTEGER, dialCtlPeerCfgTrapEnable INTEGER, dialCtlPeerCfgStatus RowStatus } dialCtlPeerCfgId OBJECT-TYPE SYNTAX INTEGER (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object identifies a single peer. There may be several entries in this table for one peer, defining different ways of reaching this peer. Thus, there may be several entries in this table with the same value of dialCtlPeerCfgId. Multiple entries for one peer may be used to support multilink as well as backup lines. A single peer will be identified by a unique value of this object. Several entries for one peer MUST have the same value of dialCtlPeerCfgId, but different ifEntries and thus different values of ifIndex." ::= { dialCtlPeerCfgEntry 1 } dialCtlPeerCfgIfType OBJECT-TYPE SYNTAX IANAifType MAX-ACCESS read-create STATUS current DESCRIPTION "The interface type to be used for calling this peer. Roeck Standards Track [Page 9] RFC 2128 Dial Control MIB March 1997 In case of ISDN, the value of isdn(63) is to be used." DEFVAL { other } ::= { dialCtlPeerCfgEntry 2 } dialCtlPeerCfgLowerIf OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "ifIndex value of an interface the peer will have to be called on. For example, on an ISDN interface, this can be the ifIndex value of a D channel or the ifIndex value of a B channel, whatever is appropriate for a given peer. As an example, for Basic Rate leased lines it will be necessary to specify a B channel ifIndex, while for semi-permanent connections the D channel ifIndex has to be specified. If the interface can be dynamically assigned, this object has a value of zero." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 3 } dialCtlPeerCfgOriginateAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-create STATUS current DESCRIPTION "Call Address at which the peer will be called. Think of this as the set of characters following 'ATDT ' or the 'phone number' included in a D channel call request. The structure of this information will be switch type specific. If there is no address information required for reaching the peer, i.e., for leased lines, this object will be a zero length string." ::= { dialCtlPeerCfgEntry 4 } dialCtlPeerCfgAnswerAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-create STATUS current DESCRIPTION "Calling Party Number information element, as for example passed in an ISDN SETUP message by a PBX or switch, for incoming calls. This address can be used to identify the peer. If this address is either unknown or identical to dialCtlPeerCfgOriginateAddress, this object will be Roeck Standards Track [Page 10] RFC 2128 Dial Control MIB March 1997 a zero length string." DEFVAL { "" } ::= { dialCtlPeerCfgEntry 5 } dialCtlPeerCfgSubAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-create STATUS current DESCRIPTION "Subaddress at which the peer will be called. If the subaddress is undefined for the given media or unused, this is a zero length string." DEFVAL { "" } ::= { dialCtlPeerCfgEntry 6 } dialCtlPeerCfgClosedUserGroup OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-create STATUS current DESCRIPTION "Closed User Group at which the peer will be called. If the Closed User Group is undefined for the given media or unused, this is a zero length string." REFERENCE "Q.931, chapter 4.6.1." DEFVAL { "" } ::= { dialCtlPeerCfgEntry 7 } dialCtlPeerCfgSpeed OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "The desired information transfer speed in bits/second when calling this peer. The detailed media specific information, e.g. information type and information transfer rate for ISDN circuits, has to be extracted from this object. If the transfer speed to be used is unknown or the default speed for this type of interfaces, the value of this object may be zero." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 8 } dialCtlPeerCfgInfoType OBJECT-TYPE SYNTAX INTEGER { other(1), speech(2), Roeck Standards Track [Page 11] RFC 2128 Dial Control MIB March 1997 unrestrictedDigital(3), -- 64k/s data unrestrictedDigital56(4), -- with 56k rate adaption restrictedDigital(5), audio31(6), -- 3.1 kHz audio audio7(7), -- 7 kHz audio video(8), packetSwitched(9), fax(10) } MAX-ACCESS read-create STATUS current DESCRIPTION "The Information Transfer Capability to be used when calling this peer. speech(2) refers to a non-data connection, whereas audio31(6) and audio7(7) refer to data mode connections." DEFVAL { other } ::= { dialCtlPeerCfgEntry 9 } dialCtlPeerCfgPermission OBJECT-TYPE SYNTAX INTEGER { originate(1), answer(2), both(3), -- both originate & answer callback(4), none(5) } MAX-ACCESS read-create STATUS current DESCRIPTION "Applicable permissions. callback(4) either rejects the call and then calls back, or uses the 'Reverse charging' information element if it is available. Note that callback(4) is supposed to control charging, not security, and applies to callback prior to accepting a call. Callback for security reasons can be handled using PPP callback." DEFVAL { both } ::= { dialCtlPeerCfgEntry 10 } dialCtlPeerCfgInactivityTimer OBJECT-TYPE SYNTAX INTEGER (0..2147483647) UNITS "seconds" MAX-ACCESS read-create STATUS current DESCRIPTION Roeck Standards Track [Page 12] RFC 2128 Dial Control MIB March 1997 "The connection will be automatically disconnected if no longer carrying useful data for a time period, in seconds, specified in this object. Useful data in this context refers to forwarding packets, including routing information; it excludes the encapsulator maintenance frames. A value of zero means the connection will not be automatically taken down due to inactivity, which implies that it is a dedicated circuit." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 11 } dialCtlPeerCfgMinDuration OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "Minimum duration of a call in seconds, starting from the time the call is connected until the call is disconnected. This is to accomplish the fact that in most countries charging applies to units of time, which should be matched as closely as possible." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 12 } dialCtlPeerCfgMaxDuration OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "Maximum call duration in seconds. Zero means 'unlimited'." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 13 } dialCtlPeerCfgCarrierDelay OBJECT-TYPE SYNTAX INTEGER (0..2147483647) UNITS "seconds" MAX-ACCESS read-create STATUS current DESCRIPTION "The call timeout time in seconds. The default value of zero means that the call timeout as specified for the media in question will apply." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 14 } dialCtlPeerCfgCallRetries OBJECT-TYPE SYNTAX INTEGER (0..2147483647) Roeck Standards Track [Page 13] RFC 2128 Dial Control MIB March 1997 MAX-ACCESS read-create STATUS current DESCRIPTION "The number of calls to a non-responding address that may be made. A retry count of zero means there is no bound. The intent is to bound the number of successive calls to an address which is inaccessible, or which refuses those calls. Some countries regulate the number of call retries to a given peer that can be made." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 15 } dialCtlPeerCfgRetryDelay OBJECT-TYPE SYNTAX INTEGER (0..2147483647) UNITS "seconds" MAX-ACCESS read-create STATUS current DESCRIPTION "The time in seconds between call retries if a peer cannot be reached. A value of zero means that call retries may be done without any delay." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 16 } dialCtlPeerCfgFailureDelay OBJECT-TYPE SYNTAX INTEGER (0..2147483647) UNITS "seconds" MAX-ACCESS read-create STATUS current DESCRIPTION "The time in seconds after which call attempts are to be placed again after a peer has been noticed to be unreachable, i.e. after dialCtlPeerCfgCallRetries unsuccessful call attempts. A value of zero means that a peer will not be called again after dialCtlPeerCfgCallRetries unsuccessful call attempts." DEFVAL { 0 } ::= { dialCtlPeerCfgEntry 17 } dialCtlPeerCfgTrapEnable OBJECT-TYPE SYNTAX INTEGER { enabled(1), disabled(2) } Roeck Standards Track [Page 14] RFC 2128 Dial Control MIB March 1997 MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates whether dialCtlPeerCallInformation and dialCtlPeerCallSetup traps should be generated for this peer." DEFVAL { disabled } ::= { dialCtlPeerCfgEntry 18 } dialCtlPeerCfgStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Status of one row in this table." ::= { dialCtlPeerCfgEntry 19 } -- Peer statistics table dialCtlPeerStatsTable OBJECT-TYPE SYNTAX SEQUENCE OF DialCtlPeerStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Statistics information for each peer entry. There will be one entry in this table for each entry in the dialCtlPeerCfgTable." ::= { dialCtlPeer 2 } dialCtlPeerStatsEntry OBJECT-TYPE SYNTAX DialCtlPeerStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Statistics information for a single Peer. This entry is effectively permanent, and contains information describing the last call attempt as well as supplying statistical information." AUGMENTS { dialCtlPeerCfgEntry } ::= { dialCtlPeerStatsTable 1 } DialCtlPeerStatsEntry ::= SEQUENCE { dialCtlPeerStatsConnectTime AbsoluteCounter32, dialCtlPeerStatsChargedUnits AbsoluteCounter32, dialCtlPeerStatsSuccessCalls AbsoluteCounter32, dialCtlPeerStatsFailCalls AbsoluteCounter32, dialCtlPeerStatsAcceptCalls AbsoluteCounter32, Roeck Standards Track [Page 15] RFC 2128 Dial Control MIB March 1997 dialCtlPeerStatsRefuseCalls AbsoluteCounter32, dialCtlPeerStatsLastDisconnectCause OCTET STRING, dialCtlPeerStatsLastDisconnectText DisplayString, dialCtlPeerStatsLastSetupTime TimeStamp } dialCtlPeerStatsConnectTime OBJECT-TYPE SYNTAX AbsoluteCounter32 UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "Accumulated connect time to the peer since system startup. This is the total connect time, i.e. the connect time for outgoing calls plus the time for incoming calls." ::= { dialCtlPeerStatsEntry 1 } dialCtlPeerStatsChargedUnits OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of charging units applying to this peer since system startup. Only the charging units applying to the local interface, i.e. for originated calls or for calls with 'Reverse charging' being active, will be counted here." ::= { dialCtlPeerStatsEntry 2 } dialCtlPeerStatsSuccessCalls OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of completed calls to this peer." ::= { dialCtlPeerStatsEntry 3 } dialCtlPeerStatsFailCalls OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of failed call attempts to this peer since system startup." ::= { dialCtlPeerStatsEntry 4 } dialCtlPeerStatsAcceptCalls OBJECT-TYPE SYNTAX AbsoluteCounter32 Roeck Standards Track [Page 16] RFC 2128 Dial Control MIB March 1997 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of calls from this peer accepted since system startup." ::= { dialCtlPeerStatsEntry 5 } dialCtlPeerStatsRefuseCalls OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of calls from this peer refused since system startup." ::= { dialCtlPeerStatsEntry 6 } dialCtlPeerStatsLastDisconnectCause OBJECT-TYPE SYNTAX OCTET STRING (SIZE (0..4)) MAX-ACCESS read-only STATUS current DESCRIPTION "The encoded network cause value associated with the last call. This object will be updated whenever a call is started or cleared. The value of this object will depend on the interface type as well as on the protocol and protocol version being used on this interface. Some references for possible cause values are given below." REFERENCE "- Bellcore SR-NWT-001953, Generic Guidelines for ISDN Terminal Equipment On Basic Access Interfaces, chapter 5.2.5.8. - Bellcore SR-NWT-002343, ISDN Primary Rate Interface Generic Guidelines for Customer Premises Equipment, chapter 8.2.5.8. - ITU-T Q.931, Appendix I. - ITU-T X.25, CAUSE and DIAGNOSTIC field values. - German Telekom FTZ 1TR6, chapter 3.2.3.4.4.4." ::= { dialCtlPeerStatsEntry 7 } dialCtlPeerStatsLastDisconnectText OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "ASCII text describing the reason for the last call termination. Roeck Standards Track [Page 17] RFC 2128 Dial Control MIB March 1997 This object exists because it would be impossible for a management station to store all possible cause values for all types of interfaces. It should be used only if a management station is unable to decode the value of dialCtlPeerStatsLastDisconnectCause. This object will be updated whenever a call is started or cleared." ::= { dialCtlPeerStatsEntry 8 } dialCtlPeerStatsLastSetupTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime when the last call to this peer was started. For ISDN media, this will be the time when the setup message was received from or sent to the network. This object will be updated whenever a call is started or cleared." ::= { dialCtlPeerStatsEntry 9 } -- -- the active call group -- callActive OBJECT IDENTIFIER ::= { dialControlMibObjects 3 } -- callActiveTable -- Table to store active call information. -- These calls could be circuit switched or they could -- be virtual circuits. -- An entry will be created when a call is started and deleted -- when a call is cleared. callActiveTable OBJECT-TYPE SYNTAX SEQUENCE OF CallActiveEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table containing information about active calls to a specific destination." ::= { callActive 1 } callActiveEntry OBJECT-TYPE SYNTAX CallActiveEntry MAX-ACCESS not-accessible Roeck Standards Track [Page 18] RFC 2128 Dial Control MIB March 1997 STATUS current DESCRIPTION "The information regarding a single active Connection. An entry in this table will be created when a call is started. An entry in this table will be deleted when an active call clears." INDEX { callActiveSetupTime, callActiveIndex } ::= { callActiveTable 1 } CallActiveEntry ::= SEQUENCE { callActiveSetupTime TimeStamp, callActiveIndex INTEGER, callActivePeerAddress DisplayString, callActivePeerSubAddress DisplayString, callActivePeerId INTEGER, callActivePeerIfIndex INTEGER, callActiveLogicalIfIndex InterfaceIndexOrZero, callActiveConnectTime TimeStamp, callActiveCallState INTEGER, callActiveCallOrigin INTEGER, callActiveChargedUnits AbsoluteCounter32, callActiveInfoType INTEGER, callActiveTransmitPackets AbsoluteCounter32, callActiveTransmitBytes AbsoluteCounter32, callActiveReceivePackets AbsoluteCounter32, callActiveReceiveBytes AbsoluteCounter32 } callActiveSetupTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS not-accessible STATUS current DESCRIPTION "The value of sysUpTime when the call associated to this entry was started. This will be useful for an NMS to retrieve all calls after a specific time. Also, this object can be useful in finding large delays between the time the call was started and the time the call was connected. For ISDN media, this will be the time when the setup message was received from or sent to the network." ::= { callActiveEntry 1 } callActiveIndex OBJECT-TYPE SYNTAX INTEGER (1..'7fffffff'h) MAX-ACCESS not-accessible STATUS current Roeck Standards Track [Page 19] RFC 2128 Dial Control MIB March 1997 DESCRIPTION "Small index variable to distinguish calls that start in the same hundredth of a second." ::= { callActiveEntry 2 } callActivePeerAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The number this call is connected to. If the number is not available, then it will have a length of zero." ::= { callActiveEntry 3 } callActivePeerSubAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The subaddress this call is connected to. If the subaddress is undefined or not available, this will be a zero length string." ::= { callActiveEntry 4 } callActivePeerId OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "This is the Id value of the peer table entry to which this call was made. If a peer table entry for this call does not exist or is unknown, the value of this object will be zero." ::= { callActiveEntry 5 } callActivePeerIfIndex OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "This is the ifIndex value of the peer table entry to which this call was made. If a peer table entry for this call does not exist or is unknown, the value of this object will be zero." ::= { callActiveEntry 6 } callActiveLogicalIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero Roeck Standards Track [Page 20] RFC 2128 Dial Control MIB March 1997 MAX-ACCESS read-only STATUS current DESCRIPTION "This is the ifIndex value of the logical interface through which this call was made. For ISDN media, this would be the ifIndex of the B channel which was used for this call. If the ifIndex value is unknown, the value of this object will be zero." ::= { callActiveEntry 7 } callActiveConnectTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime when the call was connected. If the call is not connected, this object will have a value of zero." ::= { callActiveEntry 8 } callActiveCallState OBJECT-TYPE SYNTAX INTEGER { unknown(1), connecting(2), connected(3), active(4) } MAX-ACCESS read-only STATUS current DESCRIPTION "The current call state. unknown(1) - The call state is unknown. connecting(2) - A connection attempt (outgoing call) is being made. connected(3) - An incoming call is in the process of validation. active(4) - The call is active. " ::= { callActiveEntry 9 } callActiveCallOrigin OBJECT-TYPE SYNTAX INTEGER { originate(1), answer(2), callback(3) } MAX-ACCESS read-only STATUS current Roeck Standards Track [Page 21] RFC 2128 Dial Control MIB March 1997 DESCRIPTION "The call origin." ::= { callActiveEntry 10 } callActiveChargedUnits OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of charged units for this connection. For incoming calls or if charging information is not supplied by the switch, the value of this object will be zero." ::= { callActiveEntry 11 } callActiveInfoType OBJECT-TYPE SYNTAX INTEGER { other(1), -- e.g. for non-isdn media speech(2), unrestrictedDigital(3), -- 64k/s data unrestrictedDigital56(4), -- with 56k rate adaption restrictedDigital(5), audio31(6), -- 3.1 kHz audio audio7(7), -- 7 kHz audio video(8), packetSwitched(9), fax(10) } MAX-ACCESS read-only STATUS current DESCRIPTION "The information type for this call." ::= { callActiveEntry 12 } callActiveTransmitPackets OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets which were transmitted for this call." ::= { callActiveEntry 13 } callActiveTransmitBytes OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION Roeck Standards Track [Page 22] RFC 2128 Dial Control MIB March 1997 "The number of bytes which were transmitted for this call." ::= { callActiveEntry 14 } callActiveReceivePackets OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets which were received for this call." ::= { callActiveEntry 15 } callActiveReceiveBytes OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of bytes which were received for this call." ::= { callActiveEntry 16 } -- -- the call history group -- callHistory OBJECT IDENTIFIER ::= { dialControlMibObjects 4 } callHistoryTableMaxLength OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-write STATUS current DESCRIPTION "The upper limit on the number of entries that the callHistoryTable may contain. A value of 0 will prevent any history from being retained. When this table is full, the oldest entry will be deleted and the new one will be created." ::= { callHistory 1 } callHistoryRetainTimer OBJECT-TYPE SYNTAX INTEGER (0..2147483647) UNITS "minutes" MAX-ACCESS read-write STATUS current DESCRIPTION "The minimum amount of time that an callHistoryEntry will be maintained before being deleted. A value of 0 will prevent any history from being retained in the Roeck Standards Track [Page 23] RFC 2128 Dial Control MIB March 1997 callHistoryTable, but will neither prevent callCompletion traps being generated nor affect other tables." ::= { callHistory 2 } -- callHistoryTable -- Table to store the past call information. The Destination number -- and the call connect and disconnect time, the disconnection cause -- are stored. These calls could be circuit switched or they could -- be virtual circuits. History of each and every call is stored, -- of successful calls as well as of unsuccessful and rejected calls. -- An entry will be created when a call is cleared. callHistoryTable OBJECT-TYPE SYNTAX SEQUENCE OF CallHistoryEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table containing information about specific calls to a specific destination." ::= { callHistory 3 } callHistoryEntry OBJECT-TYPE SYNTAX CallHistoryEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The information regarding a single Connection." INDEX { callActiveSetupTime, callActiveIndex } ::= { callHistoryTable 1 } CallHistoryEntry ::= SEQUENCE { callHistoryPeerAddress DisplayString, callHistoryPeerSubAddress DisplayString, callHistoryPeerId INTEGER, callHistoryPeerIfIndex INTEGER, callHistoryLogicalIfIndex InterfaceIndex, callHistoryDisconnectCause OCTET STRING, callHistoryDisconnectText DisplayString, callHistoryConnectTime TimeStamp, callHistoryDisconnectTime TimeStamp, callHistoryCallOrigin INTEGER, callHistoryChargedUnits AbsoluteCounter32, callHistoryInfoType INTEGER, callHistoryTransmitPackets AbsoluteCounter32, callHistoryTransmitBytes AbsoluteCounter32, callHistoryReceivePackets AbsoluteCounter32, Roeck Standards Track [Page 24] RFC 2128 Dial Control MIB March 1997 callHistoryReceiveBytes AbsoluteCounter32 } callHistoryPeerAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The number this call was connected to. If the number is not available, then it will have a length of zero." ::= { callHistoryEntry 1 } callHistoryPeerSubAddress OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The subaddress this call was connected to. If the subaddress is undefined or not available, this will be a zero length string." ::= { callHistoryEntry 2 } callHistoryPeerId OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "This is the Id value of the peer table entry to which this call was made. If a peer table entry for this call does not exist, the value of this object will be zero." ::= { callHistoryEntry 3 } callHistoryPeerIfIndex OBJECT-TYPE SYNTAX INTEGER (0..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "This is the ifIndex value of the peer table entry to which this call was made. If a peer table entry for this call does not exist, the value of this object will be zero." ::= { callHistoryEntry 4 } callHistoryLogicalIfIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current Roeck Standards Track [Page 25] RFC 2128 Dial Control MIB March 1997 DESCRIPTION "This is the ifIndex value of the logical interface through which this call was made. For ISDN media, this would be the ifIndex of the B channel which was used for this call." ::= { callHistoryEntry 5 } callHistoryDisconnectCause OBJECT-TYPE SYNTAX OCTET STRING (SIZE (0..4)) MAX-ACCESS read-only STATUS current DESCRIPTION "The encoded network cause value associated with this call. The value of this object will depend on the interface type as well as on the protocol and protocol version being used on this interface. Some references for possible cause values are given below." REFERENCE "- Bellcore SR-NWT-001953, Generic Guidelines for ISDN Terminal Equipment On Basic Access Interfaces, chapter 5.2.5.8. - Bellcore SR-NWT-002343, ISDN Primary Rate Interface Generic Guidelines for Customer Premises Equipment, chapter 8.2.5.8. - ITU-T Q.931, Appendix I. - ITU-T X.25, CAUSE and DIAGNOSTIC field values. - German Telekom FTZ 1TR6, chapter 3.2.3.4.4.4." ::= { callHistoryEntry 6 } callHistoryDisconnectText OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "ASCII text describing the reason for call termination. This object exists because it would be impossible for a management station to store all possible cause values for all types of interfaces. It should be used only if a management station is unable to decode the value of dialCtlPeerStatsLastDisconnectCause." ::= { callHistoryEntry 7 } callHistoryConnectTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION Roeck Standards Track [Page 26] RFC 2128 Dial Control MIB March 1997 "The value of sysUpTime when the call was connected." ::= { callHistoryEntry 8 } callHistoryDisconnectTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime when the call was disconnected." ::= { callHistoryEntry 9 } callHistoryCallOrigin OBJECT-TYPE SYNTAX INTEGER { originate(1), answer(2), callback(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "The call origin." ::= { callHistoryEntry 10 } callHistoryChargedUnits OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of charged units for this connection. For incoming calls or if charging information is not supplied by the switch, the value of this object will be zero." ::= { callHistoryEntry 11 } callHistoryInfoType OBJECT-TYPE SYNTAX INTEGER { other(1), -- e.g. for non-isdn media speech(2), unrestrictedDigital(3), -- 64k/s data unrestrictedDigital56(4), -- with 56k rate adaption restrictedDigital(5), audio31(6), -- 3.1 kHz audio audio7(7), -- 7 kHz audio video(8), packetSwitched(9), fax(10) } MAX-ACCESS read-only Roeck Standards Track [Page 27] RFC 2128 Dial Control MIB March 1997 STATUS current DESCRIPTION "The information type for this call." ::= { callHistoryEntry 12 } callHistoryTransmitPackets OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets which were transmitted while this call was active." ::= { callHistoryEntry 13 } callHistoryTransmitBytes OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of bytes which were transmitted while this call was active." ::= { callHistoryEntry 14 } callHistoryReceivePackets OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets which were received while this call was active." ::= { callHistoryEntry 15 } callHistoryReceiveBytes OBJECT-TYPE SYNTAX AbsoluteCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of bytes which were received while this call was active." ::= { callHistoryEntry 16 } -- Traps related to Connection management dialControlMibTrapPrefix OBJECT IDENTIFIER ::= { dialControlMib 2 } dialControlMibTraps OBJECT IDENTIFIER ::= { dialControlMibTrapPrefix 0 } dialCtlPeerCallInformation NOTIFICATION-TYPE OBJECTS { Roeck Standards Track [Page 28] RFC 2128 Dial Control MIB March 1997 callHistoryPeerId, callHistoryPeerIfIndex, callHistoryLogicalIfIndex, ifOperStatus, callHistoryPeerAddress, callHistoryPeerSubAddress, callHistoryDisconnectCause, callHistoryConnectTime, callHistoryDisconnectTime, callHistoryInfoType, callHistoryCallOrigin } STATUS current DESCRIPTION "This trap/inform is sent to the manager whenever a successful call clears, or a failed call attempt is determined to have ultimately failed. In the event that call retry is active, then this is after all retry attempts have failed. However, only one such trap is sent in between successful call attempts; subsequent call attempts result in no trap. ifOperStatus will return the operational status of the virtual interface associated with the peer to whom this call was made to." ::= { dialControlMibTraps 1 } dialCtlPeerCallSetup NOTIFICATION-TYPE OBJECTS { callActivePeerId, callActivePeerIfIndex, callActiveLogicalIfIndex, ifOperStatus, callActivePeerAddress, callActivePeerSubAddress, callActiveInfoType, callActiveCallOrigin } STATUS current DESCRIPTION "This trap/inform is sent to the manager whenever a call setup message is received or sent. ifOperStatus will return the operational status of the virtual interface associated with the peer to whom this call was made to." ::= { dialControlMibTraps 2 } -- conformance information Roeck Standards Track [Page 29] RFC 2128 Dial Control MIB March 1997 dialControlMibConformance OBJECT IDENTIFIER ::= { dialControlMib 3 } dialControlMibCompliances OBJECT IDENTIFIER ::= { dialControlMibConformance 1 } dialControlMibGroups OBJECT IDENTIFIER ::= { dialControlMibConformance 2 } -- compliance statements dialControlMibCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for entities which implement the DIAL CONTROL MIB" MODULE -- this module MANDATORY-GROUPS { dialControlGroup, callActiveGroup, callHistoryGroup, callNotificationsGroup } ::= { dialControlMibCompliances 1 } -- units of conformance dialControlGroup OBJECT-GROUP OBJECTS { dialCtlAcceptMode, dialCtlTrapEnable, dialCtlPeerCfgIfType, dialCtlPeerCfgLowerIf, dialCtlPeerCfgOriginateAddress, dialCtlPeerCfgAnswerAddress, dialCtlPeerCfgSubAddress, dialCtlPeerCfgClosedUserGroup, dialCtlPeerCfgSpeed, dialCtlPeerCfgInfoType, dialCtlPeerCfgPermission, dialCtlPeerCfgInactivityTimer, dialCtlPeerCfgMinDuration, dialCtlPeerCfgMaxDuration, dialCtlPeerCfgCarrierDelay, dialCtlPeerCfgCallRetries, dialCtlPeerCfgRetryDelay, dialCtlPeerCfgFailureDelay, dialCtlPeerCfgTrapEnable, dialCtlPeerCfgStatus, dialCtlPeerStatsConnectTime, dialCtlPeerStatsChargedUnits, dialCtlPeerStatsSuccessCalls, dialCtlPeerStatsFailCalls, Roeck Standards Track [Page 30] RFC 2128 Dial Control MIB March 1997 dialCtlPeerStatsAcceptCalls, dialCtlPeerStatsRefuseCalls, dialCtlPeerStatsLastDisconnectCause, dialCtlPeerStatsLastDisconnectText, dialCtlPeerStatsLastSetupTime } STATUS current DESCRIPTION "A collection of objects providing the DIAL CONTROL capability." ::= { dialControlMibGroups 1 } callActiveGroup OBJECT-GROUP OBJECTS { callActivePeerAddress, callActivePeerSubAddress, callActivePeerId, callActivePeerIfIndex, callActiveLogicalIfIndex, callActiveConnectTime, callActiveCallState, callActiveCallOrigin, callActiveChargedUnits, callActiveInfoType, callActiveTransmitPackets, callActiveTransmitBytes, callActiveReceivePackets, callActiveReceiveBytes } STATUS current DESCRIPTION "A collection of objects providing the active call capability." ::= { dialControlMibGroups 2 } callHistoryGroup OBJECT-GROUP OBJECTS { callHistoryTableMaxLength, callHistoryRetainTimer, callHistoryPeerAddress, callHistoryPeerSubAddress, callHistoryPeerId, callHistoryPeerIfIndex, callHistoryLogicalIfIndex, callHistoryDisconnectCause, callHistoryDisconnectText, callHistoryConnectTime, callHistoryDisconnectTime, Roeck Standards Track [Page 31] RFC 2128 Dial Control MIB March 1997 callHistoryCallOrigin, callHistoryChargedUnits, callHistoryInfoType, callHistoryTransmitPackets, callHistoryTransmitBytes, callHistoryReceivePackets, callHistoryReceiveBytes } STATUS current DESCRIPTION "A collection of objects providing the Call History capability." ::= { dialControlMibGroups 3 } callNotificationsGroup NOTIFICATION-GROUP NOTIFICATIONS { dialCtlPeerCallInformation, dialCtlPeerCallSetup } STATUS current DESCRIPTION "The notifications which a Dial Control MIB entity is required to implement." ::= { dialControlMibGroups 4 } END 4. Acknowledgments This document was produced by the ISDN MIB Working Group. Special thanks is due to the following persons: Ed Alcoff Fred Baker Bibek A. Das Ken Grigg Jeffrey T. Johnson Glenn Kime Oliver Korfmacher Kedar Madineni Bill Miskovetz David M. Piscitello Lisa A. Phifer Randy Roberts Hascall H. Sharp Hongchi Shih Robert Snyder Bob Stewart Ron Stoughton James Watt Roeck Standards Track [Page 32] RFC 2128 Dial Control MIB March 1997 5. References [1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1902, January 1996. [2] McCloghrie, K., and M. Rose, Editors, "Management Information Base for Network Management of TCP/IP-based internets: MIB-II", STD 17, RFC 1213, Hughes LAN Systems, Performance Systems International, March 1991. [3] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "A Simple Network Management Protocol (SNMP)", STD 15, RFC 1157, SNMP Research, Performance Systems International, MIT Lab for Computer Science, May 1990. [4] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996. [5] ITU-T Recommendation "Digital subscriber Signalling System No. 1 (DSS 1) - ISDN user-network interface layer 3 specification for basic call control", Rec. Q.931(I.451), March 1993. [6] ITU-T Recommendation "Generic procedures for the control of ISDN supplementary services ISDN user-network interface layer 3 specification", Rec. Q.932(I.452). [7] ITU-T Recommendation "Digital subscriber Signalling System No. 1 (DSS 1) - Signalling specification for frame-mode basic call control", Rec. Q.933. [8] McCloghrie, K. and F. Kastenholz, "Evolution of the Interfaces Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software, January 1994. 6. Security Considerations Information in this MIB may be used by upper protocol layers for security purpose. The implementor should be aware that supporting generic peers as described in section 3.4 may cause a security hole. The user would not know where a call is from, which could potentially allow unauthorized access if there is no other authentication scheme, e.g. PPP authentication, available. Roeck Standards Track [Page 33] RFC 2128 Dial Control MIB March 1997 7. Author's Address Guenter Roeck cisco Systems 170 West Tasman Drive San Jose, CA 95134 U.S.A. Phone: +1 408 527 3143 EMail: groeck@cisco.com Roeck Standards Track [Page 34]