Changing the Interdigit Timeout in CallManager

To change the interdigit timeout value go to Service -> Service Parameters -> Select the CCM server and the “Cisco CallManager” Service.  Once there do a “ctrl-f” to open up the find window in Internet Explorer.  The enter 302 in the “Find what:” box and then click “Find Next”.  This will bring you down to the “T302 Timer (msec)*”.  Enter the desired value in milliseconds and click “Update”.  Finally restart the CCM service.  Application -> Cisco CallManager Serviceability -> Tools -> Control Center.  Now select the server then click the radio button for Cisco CallManager and finally “Restart”.

From CCM in regards to the T302 timer:

T302 Timer : This parameter specifies an interdigit timer for sending the SETUP ACK message. The timer restarts each time Cisco CallManager receives a digit. When this timer expires, Cisco CallManager routes the dialed digits. For exact timer definitions, refer to the Q.931 specification.
This is a required field.
Default: 15000.
Unit: msec.
Minimum: 3000.
Maximum: 75000.

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