one of our customer facing a issues when trying use the SIP trunk to call out
CUCM10.5 ->SIP Trunk-->CUBE-->SIP-->TELCO
customer can receive the call from the telco via this sip ,and works fine. But when customer trying to make a call out will get the fast busy tone. i try to use debug voip ccapi inout and found the disconnect cause as below:
Disconnect Cause (CC) : 41
Disconnect Cause (SIP) : 500
the full log is attached for reference , please help.
ok, please find the running config in attached
more information that:
this cube have E1 and SIP trunk connection from provider , we use cor list to control the extension to use which path to call out. extension 38XXX will use SIP , and extension 35XXX will use the E1. and the E1 is working fine with any issues
and more information from customer , they can use the this SIP trunk to make the international call (eg. 0061XXXXXX) , only the local call will fail with fast busy tone...so strange...
I agree with Nipun, you'll need to contact your service provider.
You may need to change something on your end but they'll have to tell you what they don't like about the INVITE. It can be incorrect source IP, calling number, or they require EO instead of DO. Or, it might be something completely on their end.