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PBX Integration Board User’s Guide
2.4. Called Number ID
Called number ID is also a feature provided within a PBX system and is usually
combined with the calling number ID. Called number ID is the phone number of
the extension being called. If a call originates from outside the PBX, it is the
number of the trunk receiving the call. The called/calling number ID remains the
same when a call is routed through the PBX system.
For example, if a call has been routed through the PBX because the first intended
extension was not answered or was busy, the final destination answering the call
can determine the extension that called, plus the extension that was originally
called.
Called number ID can also be used by an application to automatically direct a call
to an appropriate extension or group of extensions based on the number called
(generally the last four digits).
For example, an application may provide specific information about four different
programs through an interactive voice response (IVR) system. Depending on the
phone number being called, the application can route the caller directly to the
desired program:
Program A: 555-1202 (trunk 01)
Program B: 555-1203 (trunk 02)
Program C: 555-1205 (trunk 03)
Program D: 555-1200 (trunk 04)
Through use of a Dialogic
®
PBX Integration Board and the Dialogic
®
Unified
API, an application can read the called number ID (the trunk line) and route the
call depending on which extension receives the call. If the call is received on
trunk line 01 it will be routed to the extension for Program A. Without access to
the called number ID information, callers would need to listen to a list of prompts
to obtain the four digit extension code to access Program A.
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