Paul,

The definition of the global call reference is a value that represent all call references on a link. Q.931 limites this to STATUS, RESTART, and RESTART ACK in that these are the only messages that can have global context. It would be valid for H.225.0 to extend this to any message that can reasonable have a global context (Remember this is not Q.931). The proposal is the use the FACILITY Message to indicate the ability of the link; that is all call references on the link. This seems reasonable.

Bob

------------------------------------------------------------------ Robert Callaghan Siemens Enterprise Networks Tel: +1.561.923.1756 Fax: +1.561.923.1403 Email: Robert.Callaghan@ICN.Siemens.com ------------------------------------------------------------------

-----Original Message----- From: Paul E. Jones [mailto:paulej@PACKETIZER.COM] Sent: Monday, June 12, 2000 2:53 AM To: ITU-SG16@mailbag.cps.intel.com Subject: Issue with APC-1804

Folks,

APC-1804 describes how an entity may signal its current ability to handle multiple connections over a call signaling channel. The intent is for this to be a dynamic capability.

Two issues: 1) This has been proposed for the H.323v3 IG. Will there be any backward compatibility issues? 2) The text of the proposal (as agreed and further truncated my me) reads:

``An entity may dynamically set the value of the multipleCalls field in order to indicate its present ability to support multiple connections along the Call Signalling Channel. If an endpoint wishes to change the value of multipleCalls at a time when no other H.225.0 messages are being exchanged across the call signalling channel, it shall transmit the multipleCalls field via a Facility message and the CRV shall be the Global Call Reference as shown in Figure 4-5/Q.931.''

The desire was to use the Global Call Reference value to indicate a change in this capability when no messages are being exchange. It was also proposed that the Facility message shall be used. However, I believe that Q.931 limits the Global Call Reference value to being used with Status, Restart, and Restart Acknowledge.

Is this a point that may become an issue for us in the future or is it acceptable that we are using the Facility message with the Global Call Reference when Q.931 forbids such use? (Perhaps I am wrong on this point.. I invite the correction!)

Thanks, Paul

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