Regarding your first question, I believe that H.225 is simply saying that a physical device can register as multiple logical endpoints, and this might be most common for a GW or MCU. It certainly doesn't mean that a PSTN GW would register once for each line. However, a GW could partition its lines in some way, and register once for each grouping. By the way, while it is not stated explicitly, I believe that in practice a device that registers multiple times must use different transport addresses (IP-port combination) in each registration, to allow each logical endpoint to be individually addressed.
Regarding your second question, a GW might register an alias for administrative or management purposes.
Gene Schroeder elemedia -----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