Patent ID: 6985957

Claim:
A gateway apparatus in an H.323 specification communication system comprising: a master gatekeeper in a first zone and having gateway control functions of an address translation function and a zone management function; a proxy gatekeeper in said first zone and having an address translation function and a zone management function out of the gateway control functions of the master gatekeeper; said proxy gatekeeper further having a call control signaling-function; and a gateway in said first zone and performing protocol conversion for communicating with other zones; said gateway having a transmitting part to transmit a first admissions request to the proxy gatekeeper; said proxy gatekeeper receiving said first admission request and having a transmission part for transmitting a location request to a gatekeeper in a second zone; said proxy gatekeeper having a receiving part for receiving a local confirm signal from said gatekeeper in said second zone; said proxy gatekeeper transmitting part transmitting an admission rejection signal to said gateway; said gateway receiving said admission rejection and said transmitting part transmitting a second admission request to said master gatekeeper; and said master gatekeeper having a receiving part for receiving said second admission request; and said master gatekeeper having a transmitting part for transmitting an admissions confirm signal to said gateway; said gateway, upon receiving said admission confirm signal from said master gatekeeper, opening a signaling channel to an endpoint in said second zone.