1.4.1. Establishing Contact with the Gatekeeper

The user at endpoint A attempts to locate a gatekeeper by sending out a Gatekeeper Request (GRQ) message and waiting for a response. When it receives a Gatekeeper Confirm (GCF) message, the endpoint registers with the Gatekeeper by sending the Registration Request (RRQ) message and waiting for a Registration Confirm (RCF) message. If more than one gatekeeper responds, endpoint A chooses only one of the responding gatekeepers. The next phase of the call scenario, Requesting Permission to Call, can now begin.

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