We have integrated our CUCM with MS Unified Messaging server. When users pressed the Messages button on the IP Phone it will dials the number configured on the Voice Mail Pilot (e.g. 13121234567). This will match a route pattern that is forwarding the call to the SIP trunks connected to the MS Unified Messaging Server. Everything is working fine but we want to display "UM Voicemail" in the phone's LCD instead of the "13121234567".
How can we do this?