I have come across a situation where i have to create a sip trunk to External Contact center in the existing MGCP gateway.I have created basic SIP configurations and dial peers to CX. However when a make a incoming test call it isn’t hitting any dial peer not even dial peer 0 . After few hours of troubleshooting i missed the basic thing i have to perform before switching between MGCP and SIP which is causing my incoming calls to fail in the gateway with error message Unallocated/unassigned number

011063: May 25 14:07:41.824: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8 callref = 0x3796
Sending Complete
Bearer Capability i = 0x9090A3
Standard = CCITT
Transfer Capability = 3.1kHz Audio
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA18381
Preferred, Channel 1
Progress Ind i = 0x8A81 – Call not end-to-end ISDN, may have in-band info
Calling Party Number i = 0x1183, ‘XXXXXXX’
Plan:ISDN, Type:International
Called Party Number i = 0xA1, ‘XXXXXX’
Plan:ISDN, Type:Unknown
*Jun 24 12:10:23.956: ISDN Se0/1/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x8029
Cause i = 0x8081 – Unallocated/unassigned number

So here is the configuration done did to make the inbound calls working

*********FOR SIP CONFIGURATION***************

voice-port 0/0/0:15
shut

int Serial0/0/0:15
shut
no isdn bind-l3 ccm-manager

controller T1 0/0/0
shut
no pri-group timeslots 1-24 service mgcp
pri-group timeslots 1-24
no shut

voice-port 0/0/0:15
no shut

int Serial0/0/0:15
no shut