Typically this error is B-Channel allocation for an outbound call. I see that you are sending and receiving call starting on the same ports. Can you switch the serial port channel selection for outbound to from desending to assending? That way the outbound will allocate in the opposite direction.
int ser x/x:15
isdn bchan-number-order ascending / decending
Other causes the Carrier is not accepting call for some reason. Try moving isdn call type and plan to unknown. It is National / unknown now.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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CUCM Database Replication is an area in which Cisco customers and
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