Weekend we migrated clients old PBX to CUCM 7.1.3-30000-1.
Setup has 2 nos of 2911 acting as MGCP gateway named as VG01 for BT and VG02 for COLT.
Gateway and the CUCM cluster are on the same LAN.
We are noticing that calls coming via VG02 (COLT) are getting disconnected intermittently after 4 seconds.
Debugs shows CUCM is not receiving Connect_ACK timer for the setup and after 4 seconds of the call, CUCM is adivsing the VG02 to drop the call.
We tried changing the T313 timer to 20K and noticed that calls disconnect after 20 seconds intermittently. ie., if 30 calls made 25 calls will be successful and 5 calls will fail.
Any thoughts regarding this issue is much apprecaited.
Thanks in advance.
Can you please grab the below data from the GW?
no logging console
no logging rate-limit
logging buffered 10000000 deb
debug isdn q931
debug mgcp packet
debug ccm-manager backhaul events
debug ccm-manager backhaul packet
Please send along the debugs and note the "calling" and "called" numbers for the failed call.