What is a best practice for the IP Address of the SRST gateway in CUCM 7? Should i be using the routers WAN IP or can i use a loopback interface?
You wouldn't want to use the WAN IP. Most folks typically use the default gateway address on the LAN for the router. From the SRST best practices guide, the call-manager-fallback config mode command "ip source-address port 2000 strict match" command is usually configured to point to the loopback address of the router and that's about all that's mentioned as far as the loopback. Like I said, most go with default gateway for the router on the LAN subnet.
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