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- From: atoscano@taronga.com (A Alan Toscano)
- Newsgroups: comp.dcom.telecom
- Subject: Re: "Secret" Phone Codes
- Message-ID: <telecom13.48.1@eecs.nwu.edu>
- Date: 26 Jan 93 19:29:27 GMT
- Sender: Telecom@eecs.nwu.edu
- Reply-To: atoscano@attmail.com
- Organization: TELECOM Digest
- Lines: 58
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 13, Issue 48, Message 1 of 13
-
- In TELECOM Digest Volume 13, Issue 45, ccoprfm@prism.gatech.edu (Monte
- Freeman), a reader in the 404 Number Plan Area, writes about his
- strange experionces with calls to 404 988-9664, with and without a
- prepended 10732- and asks:
-
- > Strange results from 404 land. Anyone got any ideas here?
-
- It's my understanding that the 732 Carrier Identificaiton Code
- facilitates switched access to AT&T's Subscriber Defined Network
- Service (SDN) and also its Virtual Telecommunication Network Service
- (VTNS).
-
- Under SDN/VTNS, each customer designs its own dialing plan, providing
- a "virtual private network." Access to SDNs are normally over
- dedicated lines, but small branch locations of a corporation might
- "PIC" their outgoing lines to 732, (or prefix seven-digit outgoing
- calls with 10732 1 700) in order to facilitate switched access to
- their SDN/VTN. As the dialing plan of one SDN will likely vary from
- that of another, the network must identify the caller, in order to
- know which SDN/VTNS dialing plan to use in routing a call. Thus ANI
- plays an important role in implementation of SDN and VTNS switched
- access.
-
- Normally, if you prefix a call with 10732 and are *NOT* an SDN/VTNS
- customer, you'll be told "You have reached a private network. You must
- be authorized to access this network..." As noted previously in the
- Digest, an exception is 10732 1 404 988-9664, which normally recites
- ANI information, presumably to assist AT&T in setting up these
- networks.
-
- (Most AT&T customers' lines are "PIC'd" to 288 and not 732, thus the
- need to include the 10732- prefix to override the PIC default.)
-
- LEC payphones normally force all "1+" calls to the "288" network
- regardless of any 10XXX code dialed (COCOTs generally block "10XXX-1+"
- calls altogether) and "10732-0+" calls are treated like "10288-0+"
- calls. Therefore, it's not generally possible to reach this ANI
- announcement from an LEC payphone. (NYTel payphones are apparently an
- exception.) This is no loss to AT&T, however, since payphones aren't
- often included in private networks!
-
- "1+" calls to 404 988-9664 carried over AT&T's normal "288" network
- and over competitors' networks, reportedly ring without answer. Only
- if the call is placed "1+" over the "732" network is ANI recited. It
- happens that 404-988 is Smyrna, GA - one of the SDN support sites. I
- suppose 404 988-9664 rings "open" on a line at AT&T's facilities
- there, and has special significance only on the "732" network. I also
- expect that AT&T will change this number if it continues to receive
- the increasingly frequent mention in the Digest that it has received
- lately!
-
- Disclaimer: I work for a VTNS customer with dedicated access, and have
- limited knowledge of 10732- switched access. Therefore, much of this
- is conjecture. I am not an AT&T employee.
-
-
- A Alan Toscano -- Houston, TX -- <atoscano@attmail.com> -- <attmail!atoscano>
-