We have an ISR-based H.323 gateway registered to a 5.1 CUCM cluster. The "MTP required" checkbox checked. The ISR has soft & hard MTP resources defined and registered, and they're listed at the top of the MRGL used by this branch's phones as well as the gateway. At the bottom of that MRGL are the soft CUCM MTP's. Sniffer traces show every call traversing the WAN and hitting the Publisher's MTP. We're not utilizing any IVR's or any 3rd party H.323 systems.
My first question is do we need MTP for this H.323 gateway? My second question is that if we do need MTP, how do we ensure that this remote branch's calls utilize local ISR-based MTP's?