A fast and easy way to test your SRST configuration without taking down the WAN interface, is to add a static route to null 0 for any ip packets coming from the network the Callmanagers are on.



This will cause phones to lose contact with all callmanagers and go into Fallback mode, while still preserving data connectivity.

Example:

CCM Sub 10.10.0.11/24

Add the following route:

ip route 10.10.0.0 255.255.255.0 null0

Once you have completed your testing, remove the route, and phones will register back with Callmanager.

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