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Embedded Gatekeeper MultiVOIP User Guide
486
Summary of H.225 RAS Messages (cont’d)
Address Translation
Messages for
Out-of-Zone Calling
An LRQ is a request message between two
H.323 gatekeepers to find the address of an
H.323 endpoint. One gatekeeper is requesting
the address translation services of the other.
If the request is granted, an LCF message is
returned.
If the request is denied, an LRJ message is
returned.
LRQ Location Request.
LCF Location Confirmation.
LRJ Location Request Rejection.
Registration Control
Messages
With an RRQ, an endpoint asks to be a
participant in the network zone controlled by
the gatekeeper. The gatekeeper can either
grant the request (by sending an RCF
message )
or deny the request
(by sending an RRJ message).
If an endpoint’s registration with the
gatekeeper is temporary, its duration is
specified in a TimeToLive field in the RCF
message sent by the gatekeeper. After the
registration duration has elapsed, the
gatekeeper will send two IRQ messages (see
“IRQ Interval” field in the Network
Parameters screen) to see if the endpoint is
still “alive.” If the endpoint responds with an
IRR, the registration will be extended. If not,
the gatekeeper will send a URQ message to
terminate the endpoint’s registration.
Thereafter, the endpoint must re-register with
a full RRQ.
RRQ Registration Request.
RCF Registration Confirmation.
RRJ Registration Rejection.