How should I configure GK in a single cluster?
For example, I have a CM and a Gateway at main site (HQ); another Gateway at remote site (BR1).
Both Gateways have PSTN connection. BR1 has IP phones registered to CM.
I still do not understand how dn(E.164) numbers are registered to Gatekeeper.
If gateways and cm are in their own zone, how the dn on BR1 site registered to Gatekeeper since these dn/phones are configured on CM?
GK is not needed in your scenario.