Solved: CUCM 7 and SRST

cowetacoit · ‎04-21-2010

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?

David Hailey · ‎04-21-2010

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.

Hailey

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Aaron Harrison · ‎04-21-2010

Use the WAN IP? So when the WAN goes down....?

Typically you use the LAN IP; this should be reasonably stable. You could use the loopback but sometimes that can be tricksy.

Aaron

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cowetacoit · ‎04-21-2010

Ok, so when the phones are assigned to the device pool they get an SRST reference, which is what they will register with in case of a WAN failure, correct? That SRST Reference needs to be their local default gateway right?

Aaron Harrison · ‎04-21-2010

Hi

The SRST reference should be whatever IP address on the SRST router is set in the 'ip source-address' command in your SRST section.

Regards

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!

Ayodeji Okanlawon · ‎04-21-2010

LOL!!! When the WAN goes down...what happens!!! good answer

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David Hailey · ‎04-21-2010

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.

Hailey

Please rate helpful posts!

cowetacoit · ‎04-21-2010

ok, i have about 15 active SRST gateways configured but this was the first real WAN deployment with a router on a stick config. The others are just MGCP/SRST gateways with just one IP address on our LAN.