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!
Your 180 RINGING message is not being sent from the CUBE.
I found this helpful to explain it:
In a similar discussion, they mention a workaround to disable early media. Is your CUCM sending 180 ringing back to the CUBE?
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.