Re: CME Co-Resident with MGCP Gateway for Migration
There will be outage, you cannot avoid it.
You will have to setup the gateway as a H323 gateway in Callmanager first. This will be a temporary config, if you use MGCP first, then all l3 call info will be backhauled to callmanager.
Use BAT to add the CME phones into Callmanager.
Once you do this you can change the dhcp option 150 at the remote site dhcp pool to point back to the callmanager. When the phones are reset (under telephony-service, you may give a reset all command), they will upgrade firmware. This may take up to 1 - 3 minutes. Once they register back to the Callmanager, they will be able to make phone calls to the PSTN or between each other.
You may change the H323 gateway to an MGCP configuration after this is done. (This will also cause minor outage).
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