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.
