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CUCM SIP Trunking Call Forwarding Issue

Question asked by seungkijung on Apr 4, 2013
Latest reply on Apr 4, 2013 by kelli.glass

Hi

 

I'm testing SIP Trunking with SIP early offer.

I use CUCM 8.6.1.20000-1, with CUBE 15.1(4)M.

 

If I tick 'MTP required' on the SIP Trunk, it works fine. This always use MTP for every call so not scalable.

 

But, if I tick "Early Offer support ...(insert MTP if needed)" and "Send send-receive SDP in mid-call INVITE" on SIP Profile, then Call Forward completes but no speech both ways.

 

What I notice is CUCM doesn't invoke MTP for call forward at all.

 

When I test Call Transfer, CUCM invokes MTP briefly and release it after the call is transfered.

 

Is it a CUCM bug or did I miss any configuration for it to work?

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