Translation pattern is a powerful tool to perform digit manipulation in CUCM for calling party or called party.
Translation pattern is similar to route pattern, however with a route pattern, when the dialed digits match the route pattern, CUCM routes the call to a gateway or through a SIP trunk, with translation pattern when the dialed digits match a translation pattern, CUCM does not route the call to a gateway or SIP trunk; instead, it performs the translation first, the resulting pattern is then re-analyzed by the system in the call routing. The new pattern may match another translation pattern and so on, finally if there is no other translation pattern, then the system routes the call or the resulting pattern through a route pattern if a match is found.
The translation pattern is useful in a distributed deployment with multisite and each site has a unique site code.
In this example, we have the following requirements:
1. The Directory Number of the phone should be the PSTN Number with E.164 format.
2. Within the same cluster, the users should use the four last digits, the internal directory number, Site-1 2XXX and Site-2 3XXX. When user at HQ Phone 1 makes a call to HQ Phone 2, he dials four digits 2002.
3. For inter-cluster calls, the users should use six digits, site cote + four last digits, Site code of Site-1 81, Site code of Site-2 is 82. When user at HQ Phone 1 makes a call to BB Phone 1, he dials six digits 82 3002.
