Mitel SUPERSET 420 User's Guide download pdf (Page 22)

PBX Integration Board User’s Guide

employees to respond to urgent calls first, as well as for automatic voice message

reply, without making users redial the caller’s extension. Calling number ID is

useful whenever you need to know who is calling and from where they are

calling.

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. When a call is 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, when a call has been routed through the PBX because the first

intended extension was not answered or 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)

Using a PBX integration board and the unified API, an application can read the

called number ID (the trunk line) and route the call depending on which

extension receive 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 long list of prompts to obtain the

four digit extension code to access Program A.

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Mitel SUPERSET 420 User's Guide Page 22