RAS terminal and gateway discovery/registration messages
coldrenr at agcs.com
Tue Nov 2 10:10:28 EST 1999
It is not true that a device that registers multiple times must use different
transport addresses. At least not in H.225 v4. Have a look at Berlin APC
1581 and TD 27. These proposals cover additive registration capabilities for
+1 623 582 7883
Gene Schroeder wrote:
> Regarding your first question, I believe that H.225 is simply saying that a physicaldevice can
> register as multiple logical endpoints, and this might be most commonfor a GW or MCU. It
> certainly doesn't mean that a PSTN GW would register oncefor each line. However, a GW could
> partition its lines in some way, and registeronce for each grouping. By the way, while it is not
> stated explicitly, I believe thatin practice a device that registers multiple times must use
> different transportaddresses (IP-port combination) in each registration, to allow each
> logicalendpoint to be individually addressed. Regarding your second question, a GW might register
> an alias for administrativeor management purposes. Gene Schroederelemedia
> -----Original Message-----
> From: Mohamed Mustafa <M.Mustafa at SDXPLC.COM>
> To: ITU-SG16 at mailbag.cps.intel.com <ITU-SG16 at mailbag.cps.intel.com>
> Date: Tuesday, November 02, 1999 6:50 AM
> Subject: RAS terminal and gateway discovery/registration messages
> Hi All,
> H.225.0 states that "one GRQ is sent per logical endpoint; thus an MCU or a Gateway
> might send many". Do I take it therefore, that a H.323-to-ISDN gateway with a maximum
> capacity of n lines must send n GRQ and RRQ messages; i.e., one for each line? If this
> is the case, can anyone shed any light on the reasoning behind it?
> Also, can anyone explain the relevance of the endpointAlias field in the GRQ message and
> the terminalAlias fields in the RRQ and RCF messages to a H.323 gateway application?
> After all, a gateway is supposed to be transparent to normal endpoints and does not need
> to be directly addressed by them.
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