IETF Logo Mail Archive

Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt

"Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com> Fri, 24 May 2013 04:20 UTC

Return-Path: <mperumal@cisco.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E1BEC21F9649 for <mmusic@ietfa.amsl.com>; Thu, 23 May 2013 21:20:26 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -10.599
X-Spam-Level:
X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id slU9mB2iNsBl for <mmusic@ietfa.amsl.com>; Thu, 23 May 2013 21:20:21 -0700 (PDT)
Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id B977A21F8E76 for <mmusic@ietf.org>; Thu, 23 May 2013 21:20:20 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2213; q=dns/txt; s=iport; t=1369369220; x=1370578820; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=VyxmAdwjskiNnLiMq4jCQ1Cx4ofba96BllCXvAhNTtE=; b=ADMIQxBJDua6YvqkWxaBeoqiPty1Il5ZWfkHx6Ly8LWGphjuUW+a3Lek ly1n9XBH+3wHjrCGR/HT1GBvduaIUkK50tdvimbxOm4SN0KnNGW710Zxl rm7b221X6MqX+yqZC5y4ljRcs4N+lUAumJ1iOBvjkfxHnhlMmcmfjRCTy c=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AiMFAAzqnlGtJV2Y/2dsb2JhbABZgwjCWIELFnSCIwEBAQQ6PwwEAgEIEQQBAQsUCQcyFAkIAgQBDQUIiAW6PY5sMQcGgm1hA6h7gw+CJg
X-IronPort-AV: E=Sophos;i="4.87,732,1363132800"; d="scan'208";a="214402110"
Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-2.cisco.com with ESMTP; 24 May 2013 04:20:19 +0000
Received: from xhc-rcd-x03.cisco.com (xhc-rcd-x03.cisco.com [173.37.183.77]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r4O4KJt4007808 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 24 May 2013 04:20:19 GMT
Received: from xmb-rcd-x02.cisco.com ([169.254.4.15]) by xhc-rcd-x03.cisco.com ([173.37.183.77]) with mapi id 14.02.0318.004; Thu, 23 May 2013 23:20:18 -0500
From: "Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com>
To: "Dale R. Worley" <worley@ariadne.com>, Parthasarathi R <partha@parthasarathi.co.in>
Thread-Topic: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
Thread-Index: AQHOWAIBpBvYmClCD0e8SeThOrsMVpkTu0ow
Date: Fri, 24 May 2013 04:20:18 +0000
Message-ID: <E721D8C6A2E1544DB2DEBC313AF54DE22410A796@xmb-rcd-x02.cisco.com>
References: <20130520161935.17435.91264.idtracker@ietfa.amsl.com> <C5E08FE080ACFD4DAE31E4BDBF944EB113508A6A@xmb-aln-x02.cisco.com> <002801ce564b$51e52230$f5af6690$@co.in> <201305230204.r4N247r25245471@shell01.TheWorld.com> <007601ce57e1$b15a5b30$140f1190$@co.in> <201305232207.r4NM7nFn5297137@shell01.TheWorld.com>
In-Reply-To: <201305232207.r4NM7nFn5297137@shell01.TheWorld.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [72.163.209.117]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Cc: "Cullen Jennings (fluffy)" <fluffy@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/mmusic>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 24 May 2013 04:20:27 -0000

|Since the annexb attribute is part of the (original) registration of
|audio/g729, any endpoint that implements that media type understands
|the annexb attribute.  If the answer does not include the annexb
|attribute, the answerer knows that it has implied the default
|"annexb=yes".

Thank you for the clarifying text. We'll include it in the next revision of the draft.

Muthu

|-----Original Message-----
|From: Dale R. Worley [mailto:worley@ariadne.com]
|Sent: Friday, May 24, 2013 3:38 AM
|To: Parthasarathi R
|Cc: Cullen Jennings (fluffy); mmusic@ietf.org; Muthu Arul Mozhi Perumal (mperumal)
|Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
|
|> From: "Parthasarathi R" <partha@parthasarathi.co.in>
|>
|> If the answerer supports RFC3551, then the answerer has to support RFC3555
|> for annexb parameter. Annexb value default value is "Yes" in RFC 3555 as per
|> RFC 3551. RFC 4856 obsoletes RFC 3555 without changing "annexb" related
|> requirement. Please let me know any reason that you wish to change AnnexB
|> parameter default value now.
|
|Sorry, my mistake, I didn't realize that "annexb" is not an extension
|of audio/g729, it's defined in the base specification:
|
|RFC 4856 section 2.1.9
|
|   Registration of Media Type audio/G729
|
|   Type name: audio
|   Subtype name: G729
|   Optional parameters:
|	[...]
|        annexb: indicates that Annex B, voice activity detection, is
|        used or preferred.  Permissible values are "yes" and "no"
|        (without the quotes); "yes" is implied if this parameter is
|        omitted.
|
|So the answer to Cullen's query is:
|
|> From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
|>
|> What happens when an endpoint that understands the anexb attribute
|> sends and offer to an endpoint that does not understand or implement
|> the anexb attribute ?
|
|Since the annexb attribute is part of the (original) registration of
|audio/g729, any endpoint that implements that media type understands
|the annexb attribute.  If the answer does not include the annexb
|attribute, the answerer knows that it has implied the default
|"annexb=yes".
|
|Dale

v2.16.0 | Report a Bug | By Email