I currently have Voice Gateway 3845 running MGCP in my environment and planning on replacing it with 3925. We also have Call Manager 7.1xxx in a cluster environment.
My action plan is as follow:
Register the New 3925 VG in call Manager in parallel to my 3845 VG then do the cutover at a later date once the new gateway is configure the way I wanted it.
Will my action plan break PSTN calls soon as I add the new 3925? Or any suggest will be greatly appreciated.
I belive it is supported with 7.1, you just need to get the correct version.
And yes, you can have multiple GWs, simply replace the GW in the Route Group(s) on the cutover night.
You can configure your 3925 in IOS.
Add it to CUCM as a gateway.
Work on this till you are happy.
The day you want to changeover
add the new gateway to the same route group
as your 3845 and physically move
your telco lines.
Remove the 3845 from the route group
Test incoming anf outgoing
If you need to revert
add the old gateway back to
route group, move telco lines back.
Remove new router from route group.
Test and resolve issues.
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