Gene, 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 an endpoint. ftp://standard.pictel.com/avc-site/9908_Ber/ Rex Coldren +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@SDXPLC.COM> To: ITU-SG16@mailbag.cps.intel.com <ITU-SG16@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.

Thanks,

Mohamed