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Universal Network Terminal TAU-32M.IP
Call establishment algorithm for a subscriber and a gatekeeper:
1.
Gatekeeper discovery:
GRQ(gatekeeper request)—sending discovery request;
GCF(gatekeeper confirm)—successful discovery.
2.
Subscriber registration on a gatekeeper:
RRQ (registration request)—registration request;
RCF (registration confirm)—successful registration.
3.
Request to access GK resources (when performing outgoing call):
ARQ (admission request)—connection request;
ACF (admission confirm)—successful response to request by the gatekeeper.
4.
Call (similar to Paragraph 8.3).
5.
GK call resources deallocation.