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4. PBX Systems
to the display. The calling number ID data sent from the PBX to the station set
differs from the calling number ID data presented on the display.
If placing a call to another extension, the called number ID (by default, the
extension of the telephone being called) is shown in the display.
Both the calling and called number IDs can be retrieved using the
d42_gtcallid( ) function. The d42_gtcallid( ) function retrieves the
called/calling number ID message sent from the PBX to the station set, not the
data sent to the display. Refer to the Dialogic
®
PBX Integration Software
Reference for more information about using d42_gtcallid( ) function.
The contents of the called/calling number ID are shown in Table 9 (as seen by
the receiver of the call).
Table 9. Called/Calling Number ID Data for the ROLM
Call Route Called/Calling Number ID Data
Call received from station set 221 _221
Call originally received by extension
221, then forwarded to extension 224
224_221
NOTE: The called/calling number ID can also be obtained using the
d42_display( ) function; however, you can use the d42_gtcallid( )
function so that your application will maintain functionality across
different manufacturers’ switches.
Example
An application uses the d42_gtcallid( ) function to retrieve the calling number
ID for a call received on a specified channel on a Dialogic
®
PBX Integration
Board. The calling number ID data and corresponding ASCII values are
shown below.
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