I think I'm going to puke. :-@ Built-in, purposeful non-backwards compatibility! Alright! We've come close in the past, but this time we hit it on the nail:
8.1.7.2 "An H.323 Version 4 or higher entity that uses Fast Connect in a call shall use H.245 tunneling when an H.245 Control Channel is required and shall always set the h245Tunneling field to TRUE. The process for switching to a separate H.245 connection is described in 8.2.3 and may be used by Version 3 or older entities or by newer H.323 entities when communicating with Version 3 or older entities for the purpose of maintaining backward compatibility."
First of all, "...when an H.245 Control Channel is required..." is redundant and should be removed because an H.245 channel is _always_ required: 6.2.8/H.323v4: "The endpoint shall establish exactly one H.245 Control Channel for each call that the endpoint is participating in." But mainly, v4 and post-v4 EPs are not interoperable with pre-v4 EPs that do not support Fast Connect. Wave goodbye to NetMeeting! :-)
Paul Long ipDialog
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