Hi folks,
I think I may have found some incorrect text in H.323 8.1
The same text appears in both V3 and V4 so I suspect nobody has commented before.
In the paragraph beginning: "An endpoint shall be capable of sending the Alerting message. ..."
it goes on to say: "If an endpoint can respond to a Setup message with a Connect, Call Proceeding, or Release Complete within 4 seconds, it is not required to send the Alerting message. An endpoint sending the Setup message can expect to receive either an Alerting, Connect, Call Proceeding, or Release Complete message within 4 seconds after successful transmission."
I believe the first sentence here should really be discussing the requirement to send a Call Proceeding (not Alerting) message. The period of 4 seconds in the last sentence is related to T303 which is specifically terminated by a Call Proceeding message in order to extend the timeout for the sending endpoint.
I think the sentence should read: "If an endpoint can respond to a Setup message with a Connect, Alerting, or Release Complete within 4 seconds, it is not required to send the Call Proceeding message."
This is then consistent with the use of Call Proceeding described in 8.1.8.2 (second para).
Peter Price
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