I have some some issue couple of days ago. The telephony system of my client worked well and suddenly the cannot make external calls via E1. I checked the config and for me it seems to be ok. When I checked the SDL file, I can see the B channel out of service error message following by the
"MGCP PROTOCOL ERROR: <S1/SU1/DS1-0/29@ATD-CCM-GW.xx.xxxx.xxx> CRCX error code: 510". They have A CUCM 6.0 and Cisco 2821 as gateway with 12.4 (25f) advance IP service IOS.
I perform the following actions without success:
-From the CUCM in the advance service I forced the Bchannel to bring it in service,
- no mgcp/mgcp, -reboot the CUCM and the Gateway,
-reset the controller throug CUCM,... in vain.
They contacted telco and has confirm that everything seems to be ok. Find below the information that can help you to undestand better
#sh run brief
Current configuration : 4859 bytes
service timestamps debug datetime msec
service timestamps log datetime msec localtime show-timezone