I have this user that wants to know by which provider her calling is being routed. We have an H323 gateway with several dial-peers with preferences. So If one trunk group is full call will be routed through the next.
Is there anyway to display in the phone display a name to identify by which trunk the call is being placed? No matter if the called number is no longer shown.
I don't think that's possible, once the call goes out from CUCM all the handling is done in the GW and CUCM has no idea of anything else related to where and how the call is routed in H323. You only get the H245 and H225 signaling related to establishing the call but none of that has the info of which carrier you're using.