Hi Pranav,  Did you try to consume REFER in the GW and passthrough the unsupported header? voice service voip  no supplementary-service sip refer sip  pass-thru headers unsupp This should send a new INVITE (REFER consumption) from GW to CUCM with the...

Hi @djohnson , Do you find a solution? I have exactly the same issue and I couldn't find how solve it yet. If you have a solution, I'll appreciate if you share it. If not, I let you know if I find something. Regards Pablo