Hi Buddy,
Per my understanding, a media-gateway should be populated in each Branch site.
Because the scenario now is all the IP phones in Branch office are connecting and managed by CM in city 1 directly. The emergency calls will be route to local PSAP in city 1 because all the calls are going out through the local trunk in Main site.
A media gateway with local PSTN trunk in Branch office will be a simple solution. All the emergency calls will be going out through local trunk via media gateway in city 2 or 3....
And I suggest that maybe you can open an Advisory case to US support team for further consultant due to specific situation in US.
Hopefully this will help you....
Regards,
Nixon
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