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Twilio SIP Trunking with CUBE

Hello all,

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: 9.1.2.11900-12).

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

and

debug ccsip all

output.

1 Accepted Solution

Accepted Solutions

The problem occurred, because the CUBE was sitting behind a NAT firewall

https://www.twilio.com/docs/sip-trunking/troubleshooting#problem30

 

Changing the SIP headers fixed the issue. 

 

View solution in original post

1 Reply 1

The problem occurred, because the CUBE was sitting behind a NAT firewall

https://www.twilio.com/docs/sip-trunking/troubleshooting#problem30

 

Changing the SIP headers fixed the issue.