State information for a call between a calling party and a called party is
established without maintaining the state information at a gate controller. A setup
request for the call is received at an originating gate controller. The originating
gate controller is connected to a trusted network. The calling party is associated
with an originating interface unit coupled to an untrusted network. The setup request
for the call is authorized. The authorized setup request is sent to the called
party. State information for the call is formatted based on a setup acknowledgment
message received from the calling party. The state information for the call is
sent from the originating gate controller to the originating interface unit without
maintaining the state information at the originating gate controller.
