The Silo Chronicles
The not so exciting adventures of a Network Engineer

One of the long standing annoyances with using a PRI in an H323 gateway in conjunction with CallManager was the lack of the ability to support Caller-ID names. If the PRI was tied to CCM via MGCP or SIP you were good but H323 you were SOL. The good news is that recently Cisco has resolved this lack of support recently. The first step is going to be upgrading your router to either 12.4(20)T, 12.4(11)XW or a later release in either train. Once that is done you need to add the following commands.

This will enable support system wide. If you wish you can also add the command to a voice class as well. Once this is added you need to enable the supplementary service on the PRI. You can do this by entering the following command on the PRI’s serial interface.

At this point you should be passing caller-id names as long as you have subscribed to the service with your provider. It should be noted that if you don’t have this service you can also break the PRI by adding the supp-service command making it always returned an un-subscribed service when placing or receiving calls. To troubleshoot this and see if you are seeing the caller-id and or figure out why calls aren’t working issue the following command:

This will give you all the signaling that goes back and forth. You should see the caller-id name text in the messages if the provider is sending it.

This entry was posted on Saturday, April 25th, 2009 at 6:16 pm and is filed under Telephony. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.