Multitech MultiVOIP MVP100GK Gatekeeper, User Manual

Page: 52 / 91

Chapter 4 – Gatekeeper Protocols
Multi-Tech Systems, Inc. MultiVOIP Gatekeeper User Guide 52
Summary of H.225 RAS Messages (cont’d)
BRQ Bandwidth Request
BCF Bandwidth Confirmation
BRJ Bandwidth Rejection
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.
IRQ Information Request
IRR Extend Registration Request.
(aka “keep-alive” request)
URQ Unregister Request.
App URQ When registration has timed out, the user application must
decide how to respond.