CUCM SIP Trunking Call Forwarding Issue

[seungkijung]

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?

[keglass]

Seung ki Jung,

This community does not provide technical support and is not staffed with technical support experts. I recommend you post this and future technical support questions to the Cisco Support Community (https://supportforums.cisco.com/index.jspa) where our Cisco technical support experts provide assistance. Another option is to open a ticket with the Cisco Technical Assistance Center (www.cisco.com/go/support) to get expert debugging assistance.

We do encourage you to participate in the Cisco Collaboration Community and to also join our Cisco Collaboration User Group program!  In the community, we encourage your discussion/sharing around collaboration topics and Cisco Collaboration Solutions, including business and IT requirements, industry trends, process, culture/organization issues, how collaboration can be used to transform businesses, vendor selection, adoption, training, architecture, licensing, and product features/functionality. If you are a customer or partner, you can also join the user group program to be eligible for member-only events and influence product direction.

We hope to hear from you again.

Kelli Glass

Moderator for the Cisco Collaboration Community