I am working on a lab setup using Twilio SIP trunk, Cisco 2821 with IOS: c2800nm-ipvoicek9-mz.151-4.M3.bin, and CUCM (System version: 126.96.36.19900-12).
I am trying to test incoming calls. The call is successfully sent to CUCM, I can hear the ringing tone, but when the call is answered, it gets disconnected (Picture attached)
I have also attached the
debug ccsip messages
debug ccsip all
Go to Solution.
The problem occurred, because the CUBE was sitting behind a NAT firewall
Changing the SIP headers fixed the issue.
View solution in original post
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