SIP digit handling

Last Updated : Oct 04, 2016 |

The Request URI in a SIP INVITE message, REFER message, or 3xx redirect response for INVITE message contains the following types of digits:

  • Called-party digits

  • Called-party and extra end-to-end digits

    For example, an authorization code or a voice mail password.

By default, Communication Manager assumes that the Request URI contains extra end-to-end digits, which might lead to incorrect call routing.

For example, a Request URI with 12 digits can match a Dial Plan entry of 7 digits. But Communication Manager processes the last 5 digits as extra digits. Similarly, for a SIP connection, if the Request URI does not contain extra digits, then the calls can be wrongly routed. The user can configure the Request URI as called number-only to avoid calls being wrongly routed.

With the SIP digit handling feature, you can configure Communication Manager to allow or restrict the extra end-to-end digits in the message.