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Issues With External Callers calling into a CTI that Routes to External Number

I have a particular scenario that is less than ideal. Basically a user dials a DID we own, its handed to our SIP Gateway and the handed to CUCM where it gets sent to a CTI route point that then forwards to an external number.However there is no ringback from either the CTI or the external number but if I call internal to the CTI i do get ringback. I have identified the traces and i do not see SDP 180 messages coming through, which I believe may be by design. I have listed the traces below from the particular call. Thank you in advanced for any help!

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Beginner

Re: Issues With External Callers calling into a CTI that Routes to External Number

Your 180 RINGING message is not being sent from the CUBE.
I found this helpful to explain it:

 

https://community.cisco.com/t5/ip-telephony-and-phones/difference-between-180-ringing-and-183-session-progress/td-p/2413632

 

In a similar discussion, they mention a workaround to disable early media. Is your CUCM sending 180 ringing back to the CUBE?

 

https://community.cisco.com/t5/ip-telephony-and-phones/cube-converting-sip-180-ringing-to-183-session-in-progress/td-p/2010478

- Jonathan Beardsley
Beginner

Re: Issues With External Callers calling into a CTI that Routes to External Number

Thank you very much for the response, Jonathan! Unfortunately it is not. It appears that the 180 ringing with SDP maybe getting converted to 183.

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