We are transitioning an old Nortel to Cisco. One of the first steps is to give Nortel users voicemail via Cisco Unity. We have PRIs (qsigs) setup between Nortel and CUCM via MGCP gateways (Cisco 2921's) and calls flow back and forth just fine. Were able to call Nortel and utilize CUC to answer the voicemail and the Nortel users can retrieve voicemails just fine, however the MWI red light on the Nortel phones won't light up. Looking at the ISDN logs on the router, I am seeing the below logs. Anyone have any ideas?
Jul 19 06:19:38: ISDN Se0/1/0:23 Q931: TX -> SETUP pd = 8 callref = 0x3BBD
Sending Complete
Bearer Capability i = 0xA880
Standard = ISO/IEC
Transfer Capability = Unrestricted Digital
Transfer Mode = Circuit
Transfer Rate = Packet - not specified
Channel ID i = 0xAC
Exclusive, Channel 34
Facility i = 0x9FAA06800100820100A117020200B3020150300EA5090A01001204383834300A0120
Calling Party Number i = 0x4181, N/A
Plan:ISDN, Type:Subscriber(local)
Called Party Number i = 0xA1, '8840'
Plan:ISDN, Type:National
Jul 19 06:19:38: ISDN Se0/1/0:23 Q931: RX <- CALL_PROC pd = 8 callref = 0xBBBD
Channel ID i = 0xAC
Exclusive, Channel 118
Jul 19 06:19:38: ISDN Se0/1/0:23 Q931: RX <- RELEASE pd = 8 callref = 0xBBBD
Cause i = 0x8195 - Call rejected
Jul 19 06:19:38: ISDN Se0/1/0:23 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x3BBD
