Integrate NEC exchange with CUCM by SIP trunk

[noc mcc]

We want to integrate SV8100 voice card NEC exchange with CUCM by SIP trunk as follows:

Cluster A--------------SIP trunk-----------SME-------------SIP trunk-----------NEC exchange.

We are getting unsupported media type error 415 sip from the wireshark capture  .

What are the required parameters we need to configure on the CUCM side.

[noc mcc]

Any parameters need to be set on the SIP trunk?

[Vivek Batra]

Can you please share the SIP trace?

- Vivek

[noc mcc]

Thanks vivek...we are not of internet so its bit problematic sharing the wireshark trace but the NEC voice card sends SIP 415 unsupported media type when cucm sends a sip invite (cisco phone dials the route pattern pointing to the SIP trunk). When the NEC exchange dials the cisco phone number, we can see in wireshark capture that no request is coming from NEC exchange (the ip address of the NEC exchange is not seen at all)

[Vivek Batra]

By default, CUCM uses SIP delayed offer which is not liked by many vendors in initial call setup. Try to modify the SIP profile and enable SIP early offer. Assign this SIP profile to SIP trunk and reset the SIP trunk. See if there is any improvement.

- Vivek