H.323 Annex E optional?
Plong at SMITHMICRO.COM
Fri Jul 30 09:09:13 EDT 1999
Okay, but what if the EP does not indicate that it has this capability?
7.9.2/H.225.0v3 currently says that the EP _shall_ use an unreliable channel
if in receipt of an RCF with useAnnexECallSignalling set to TRUE. Period.
Regardless of whether the endpoint indicated the capability in its RRQ. The
following would eliminate the ambiguity and possible misunderstanding:
7.9.2/H.225.0v3: "useAnnexECallSignalling - If TRUE and
supportsAnnexECallSignalling was set to TRUE in the RRQ to which this
message is in response, the endpoint receiving this message shall use call
signaling exclusively on an unreliable transport channel as described in
H.323 Annex E when placing calls."
Smith Micro Software, Inc.
From: Paul E. Jones
To: ITU-SG16 at MAILBAG.INTEL.COM
Sent: 7/29/99 8:58 PM
Subject: Re: H.323 Annex E optional?
The endpoint does not indicate a preference-- it is to indicate
The gatekeeper may force an endpoint to use Annex E by setting the flag
----- Original Message -----
From: Paul Long <Plong at SMITHMICRO.COM>
To: <ITU-SG16 at mailbag.cps.intel.com>
Sent: Tuesday, July 27, 1999 7:53 PM
Subject: H.323 Annex E optional?
> Is H.323 Annex E optional? H.225.0 says that an EP can indicate in an
> (and a GK, in an LCF) whether it supports H.323 Annex E
> an unreliable channel), so Annex E is apparently optional. For
> 7.9.1/H.225.0v3: "supportsAnnexECallSignalling - If TRUE, this
> that the sender of this message is capable of call signalling [sic] on
> unreliable transport channel as described in H.323 Annex E."
> However, H.225.0 also says that via an RCF or ACF a GK can force an EP
> use Annex E. For example,
> 7.9.2/H.225.0v3: "useAnnexECallSignalling - If TRUE, this parameter
> indicates that the endpoint receiving this message shal [sic] use call
> signalling [sic] exclusively on an unreliable transport channel as
> in H.323 Annex E when placing calls."
> There is nothing in the Recommendations that requires a GK to abide by
> EP's capabilities. Is this an oversight, or does the EP merely
> its RRQ a preference for supporting Annex E, and it must therefore
> this Annex?
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