Has anyone had troubles getting the SIP trunk to work properly between these two systems? The trunk seems to work, but the RTP stream is avoiding the Avaya Session Manager completely. From what i can tell, the SIP packet is getting changed on the user agent and marking the destionation as the CUCM rather than the Session Manager. So the RTP stream goes from the end device on Avaya to the CUCM. Basically, we are trying to trunk the call between the PBXs so RTP flows from one system to the next... not around the Session Manager.
I am a bit confused by your question. In that scenario the 'natural flow' would be for RTP to flow directly between the ipphone and ExchangeUM. Forcing MTP on CUCM forces the RTP to flow through CM's MTP resources (on the CM if using software mtp, otherwise hardware mtp on c6k or ios). None of this would force RTP to flow through session manager. If you want to force RTP through session manager then session manager is the one that needs either MTP resources or to behave as a session border controller.
The default in most voip call control protocols is to establish RTP directly between endpoints bypassing the potential bottleneck of central control.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...