Cisco: Configure Interdigit Timeout to Reduce Dial Delay

In order to allow sufficient time for a user to dial a telephone number, Cisco CallManager relies on a timer referred to as the interdigit timeout. This parameter indicates the duration Cisco CallManager waits after each digit is entered before it assumes the user has finished entering digits. However, users of Cisco IP phone can encounter instances when Cisco IP phone takes several seconds to connect the call after dialing all the digits in the called party's phone number.

Cisco CallManager contains a service parameter that enables you to change the interdigit timeout value. You can easily configure this parameter. The default timeout is set to 10 seconds. If you do not modify the settings, the system waits 10 seconds after each digit for a new one to be introduced. Consequently, after the last digit has been inserted, the CallManager routes the call after 10 seconds. You can observe this especially on variable-length dialplan configurations. Please change the service parameter by following the steps below:
1. Select Service > Service Parameters to go to Cisco CallManager System Parameters from the Cisco CallManager Administration page.
2. Select the name of your server and service from the Server and Service fields.
3. Select TimerT302_msec.
4. In the Value field, type the timeout you want to configure (specify the time in milliseconds). For example, if you want to configure 7 seconds as the interdigit timeout, type 7000.
* Note: Do not set the interdigit timeout value too low, otherwise the user does not have enough time to enter the digits while calling.
5. Click Update.
6. Restart Cisco CallManager to implement the changes.