If you have two zones, zone1 and zone2, with gateways in each zone; gtwy1 in zone1 and gtwy2 in zone2, then call routing will be based on zone prefix configured and technology prefix.
If configured, gateways register to gatekeeper with a technology prefix. An incoming call into gatekeeper will be matched with technology prefix and zone prefix. Based on the configuration you do, the call will be routed to a specific gateway in the zone when a prefix match is found. If no specific gateway destination is found, the call will be sent to multiple gateways which register with default technology-prefix.
Can you tell me what you are actually trying to achieve, and if you have any config that you are working on or referring to?
The gatekeeper will choose all those gateways in any local zone which register to the gatekeeper with the default technology prefix. Whichever gateway knows the route to the called number will accept the call.
If no default technology prefix is configured, the gatekeeper will reject the call.
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