1	PDQTapi Control
2	PDQTapi Property Page
3	You are not licensed to use the PDQTapi control in a development environment.\n Please contact Crescent at 617-280-3000 for information on obtaining a license.
100	General
1000	TAPI is busy.
1001	The varControl parameter is not PDQComm or an older version that does not support TAPI.
1002	The selected device can not place a call.
1003	The varControl parameter is not an OLE control.
1004	Unspecified OLE Automation error.
1005	The varControl parameter does not contain an AddItem method.
2001	The line cannot be opened due to a "persistent" condition, such as that of a serial port being exclusively opened by another process.
2002	The specified device ID or line device ID (such as in a dwDeviceID parameter) is invalid or out of range.
2003	The call's bearer mode cannot be changed to the specified bearer mode. 
2004	Unspecified TAPI error
2005	All call appearances on the specified address are currently in use.
2006	The maximum number of outstanding call completions has been exceeded.
2007	The maximum number of parties for a conference has been reached, or the requested number of parties cannot be satisfied.
2008	The dialable address parameter contains dialing control characters that are not processed by the service provider.
2009	The dialable address parameter contains dialing control characters that are not processed by the service provider.
2010	The dialable address parameter contains dialing control characters that are not processed by the service provider.
2011	The dialable address parameter contains dialing control characters that are not processed by the service provider.
2012	The application requested an API version or version range that is either incompatible or cannot be supported by the Telephony API implementation and/or corresponding service provider.
2013	The application requested an extension version range that is either invalid or cannot be supported by the corresponding service provider.
2014	The file TELEPHON.INI cannot be read or understood properly by TAPI.DLL because of internal inconsistencies or formatting problems. For example, the [Locations], [Cards], or [Countries] section of TELEPHON.INI may be corrupted or inconsistent.
2015	The line device is in use and cannot currently be configured, allow a party to be added, allow a call to be answered, allow a call to be placed, or allow a call to be transferred.
2016	A specified address is either invalid or not allowed. If invalid, the address contains invalid characters or digits, or the deistination address contains dialing control characters (W, @, $, or ?) that are not supported by the service provider. If not allowed, the specified address is either not assigned to the specified line or is not valid for address redirection.
2017	The specified address ID is either invalid or out of range.
2018	The specified address mode is invalid.
2019	dwAddressStates contains one or more bits that are not LINEADDRESSSTATE_ constants.
2020	The application handle (such as specified by a hLineApp parameter) or the appliction registration handle is invalid.
2021	The specified application name is invalid. If an application name is specified by the application, it is assumed that the string does not contain any non-displayable characters, and is zero-terminated.
2022	The specified bearer mode is invalid.
2023	The specified completion is invalid.
2024	No TAPI error string.
10000	The strAddress parameter can not be null.
10001	Unable to translate the strAddress parameter into a dialable address.
10002	Out of memory.
20000	8878B000-75A8-11CF-B3F7-00AA00B77521
20001	1C03CB80-75A8-11CF-98D5-0080C7116908
20002	77B00F80-75D3-11CF-87F3-0080C7973784
20003	0E5666E0-75A9-11CF-A308-0020AFA5C82F
20004	FFE11E60-75A9-11CF-A123-0020AF299573