[AVT] rtpmap and fmtp for telephone-event

"Murat Artun" <artunmurat@gmail.com> Mon, 25 September 2006 07:43 UTC

Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1GRl7S-0006HG-Ka; Mon, 25 Sep 2006 03:43:14 -0400
Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1GRl7R-0006HB-60 for avt@ietf.org; Mon, 25 Sep 2006 03:43:13 -0400
Received: from wx-out-0506.google.com ([66.249.82.234]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1GRl7P-0000Dr-WB for avt@ietf.org; Mon, 25 Sep 2006 03:43:13 -0400
Received: by wx-out-0506.google.com with SMTP id t4so1815338wxc for <avt@ietf.org>; Mon, 25 Sep 2006 00:43:11 -0700 (PDT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=HJwdIikPLYT0O75VwmnnSLcXkJt3AWaxBxE/wXUwsmAzkjLD7CufEQS6jmQJx/4Wze4yjQQ5JOPsY2X+5nzS5R22N/8bRbQBhD7ZVYPaYx/Gq2wqFutw/rleYJincV+aO8zwKjh+gJ2P2ncy2Pi/EkHOGsA6LcAft8b+AiM0XBs=
Received: by 10.70.108.18 with SMTP id g18mr6587029wxc; Mon, 25 Sep 2006 00:43:11 -0700 (PDT)
Received: by 10.70.35.13 with HTTP; Mon, 25 Sep 2006 00:43:11 -0700 (PDT)
Message-ID: <4e5a3720609250043s14978c50s9fd9309900a13712@mail.gmail.com>
Date: Mon, 25 Sep 2006 10:43:11 +0300
From: Murat Artun <artunmurat@gmail.com>
To: avt@ietf.org
MIME-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 79899194edc4f33a41f49410777972f8
Subject: [AVT] rtpmap and fmtp for telephone-event
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Audio/Video Transport Working Group <avt.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
Errors-To: avt-bounces@ietf.org

Hello,

Both in RFC2833 and draft-ietf-avt-rfc2833bis-15 it was specified that
SDP usage is recommended for telephone-event payload format, or I have
interpreted it to be so. In RFC 2833 it was said that: "Receivers MAY
indicate which named events they can handle, for example, by using the
Session Description Protocol (RFC 2327 [7])." In addition, latest
draft indicates in section "Relationship to SDP" that mapping is
recommended.

Considering these, can we say that it is possible for an IP phone that
announces a codec type specification for the telephone-event omits
using fmtp? If this is possible, will the other IP phone which
receives this SDP, interpret it as to be that the remote end is ready
to receive only 0-15?

Thanks.
-- 
M u r at  A r t u n, MSc.
   Software Engineer

_______________________________________________
Audio/Video Transport Working Group
avt@ietf.org
https://www1.ietf.org/mailman/listinfo/avt