Please follow the following scenario. I have a SIP Trunk on CUCM. That SIP trunk has an MRGL with HW MTPs (SW IOS BASED MTPs) in a MRG-A and SW MTPs (SW on IPVMS) on MRG-B. Let say for example that I have Type A Phones 7940/7960/etc. If I checked MTP Required on the SIP Trunk then CUCM chooses the MTPs based on the MRGL of the trunk and selects the HW MTPs (IOS based). But if instead of checking the MTP Required on the SIP Trunk I decided to enable "Early Offer support for voice and video calls (insert MTP if needed)" on the SIP Profile for the SIP Trunk (as it seems that is the best option now for not using MTP all the time) then when checking the calls setup CUCM always insert an MTP from the IPVMS instead of using the same MRGL logic and using the HW MTP.
My question is if using "Early Offer support for voice and video calls (insert MTP if needed)" on the SIP Trunk. Where does CUCM decides to pick the MTP from? Using the originating device MRGL? or using the SIP Trunk MRGL?
Thanks in advanced and sorry if that was already answered here.
When Early Offer support for voice and video calls (insert MTP if needed) is configured on a trunk's SIP Profile, calls from older SCCP-based phones (see Endpoint Features Summary ), SIP Delayed Offer trunks, and H.323 Slow Start trunks will cause Unified CM to allocate an MTP if an MTP or transcoder has not already been allocated for that call for another reason. The MTP is used to generate an offer SDP with a valid media port and IP address. The MTP will be allocated from the media resources associated with the calling device rather than from the outbound SIP trunk's media resources. (This prevents the media path from being anchored to the outbound SIP trunk's MTP). If the MTP cannot be allocated from the calling device's media resource group list (MRGL), then the MTP allocation is attempted from the SIP trunk's MRGL.
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