From: "Law, Will" <wilaw@akamai.com>
To: MOQ Mailing List <moq@ietf.org>
Thread-Topic: Sender Side Track Switching (SSTS)
Thread-Index: AQHdJBroG5gpfMQsq0GNwc03ihhIcQ==
Date: Tue, 4 Aug 2026 14:41:43 +0000
Message-ID: 
 <SA1PR17MB45457B57DA60C15AD4DF0514DFD42@SA1PR17MB4545.namprd17.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: 
 =?Windows-1252?Q?2iTQdk68fFv7Bx6hhJnUlo9BPNnYzt6WpEit+2PbY6WV7XrSOZGfaesg?=
 =?Windows-1252?Q?jq3oPhHxnjBUHCW488Zw/Z2xuo+0fHHsRj7K6przXJh9T7d5tYvlKTxr?=
 =?Windows-1252?Q?VoWP9x+n3FclSU1BzzgosxOFMjK3g0xqkBfNpilHE9d02xHbe/vH67Cj?=
 =?Windows-1252?Q?t3psK64vh/8K8rOaDDlfDtzJM54s/4Nxtf3cG8+d9SN9aathalR8GQzc?=
 =?Windows-1252?Q?Il4umu/qucWMlDxFJwnjLciIwYHJBiXIyJOmIka0XMbfIJCYY8GpklSA?=
 =?Windows-1252?Q?02foydyMY03Lfnn8xYWXudcGxXAR218iw1ZiSLM3q6IJUPKQ2A7Ogi5V?=
 =?Windows-1252?Q?rSZk+U6NbUDlGhwXn8cvccTlOpOR8kUEeVS/MSit0iLs6s35l8KaPHO6?=
 =?Windows-1252?Q?NuaWko1hv4si8xi1Ll6egLtWvAAf7O640l4QQlbX2A09fpP8GiEHeUl3?=
 =?Windows-1252?Q?aPMQauTzsqqHHWuAsCT1GjMRkrqE0tR56j9X/xdNsUeUDoeudotBmsG1?=
 =?Windows-1252?Q?FaATAm3KshvmFASwFtl/GlYBwfjTGY1d1rhitwI4SBz9HwrkgLjWygY4?=
 =?Windows-1252?Q?35wgoFLBI2IXSHDCfXadh7dpEGzeOY6bKJUWWXO9sYTHBsv6ELu3xA6O?=
 =?Windows-1252?Q?JGQEWZqdslTKKNnmCHP4+gVJ/rXizAIo8sJ1RlDeSeOjyZk/cZ81NsVl?=
 =?Windows-1252?Q?uIofCm3gmNMT1ww6hCxWadQkA7UxrfbvyS0xTUvPDMF9yOAx1BKRCDRs?=
 =?Windows-1252?Q?k9OwBrrt9yGq+9UMv0W4RpxX5604oEwqRLy5b/HDtCtupTL0AevNt/XA?=
 =?Windows-1252?Q?vWst+gkzQUEeB96dpaA+V7dcnM2FooJH+l6Na6LU47PxOwp/+725Ri39?=
 =?Windows-1252?Q?z7kVk1j13qVEvuEuDNEXQGFcXHgVRVBhWG8BIQSE3WGIx5y2OwPLhxLG?=
 =?Windows-1252?Q?/hp+XJuJ9mQX0lEn8HSNzR0d+ri9c04dKiUfMUrCImAx1A15jVzFmDCT?=
 =?Windows-1252?Q?wIEupxhw4DCyKgKVPqsGtVj9DoMZ6dR8nLHEuHfCMoJ4bivgBteYU9W1?=
 =?Windows-1252?Q?+hIKlzTZhm4iC4xe3QM+gJEocsq2ic2u3aPNj0mCdy36zECf1guAu2Wq?=
 =?Windows-1252?Q?YPcZugeVwJI6O3+m2A84D3VukXEjmvaExaD54ujf0vyIeJFr1o94Lzog?=
 =?Windows-1252?Q?LjH56ukksNaXHhqKzzyZDglDaTgegf5yYnkg5nOIp6PF0HMJZQfyre9X?=
 =?Windows-1252?Q?O3yO2eenoskffM6c6/Qw3kvJdaDXQZ01hUb7MttjNkCA4CNAuI5LKc5A?=
 =?Windows-1252?Q?cwkYLqXxTZM/kZM5EEFXVtC1OoE5Td3fzJMQJrVzglVrzqk9ACTv9SWd?=
 =?Windows-1252?Q?0tajyODnz4ei/NuA2RRAcPMGeg0YFzrVHD78n50hfkernN5U7VFkDnTY?=
 =?Windows-1252?Q?A8GuIVNHcWtDFggsu4XyZG/kI8c2yCW/A4qltCr3SLi0M6uKROFJNR2Q?=
 =?Windows-1252?Q?KGp8gvJ5wU8j3ZAh9u+td4SR85dg+VdQlAYsd/qCNFHJzha8AlGqhIxS?=
 =?Windows-1252?Q?EN9K4AE78C4LIeNf7k41NgK9gLgUQf3tvQWaNdv4je1ZbK2RwZqAksOG?=
 =?Windows-1252?Q?z1hR5Yg2cluYpC0KzRCTSyp6e0iMEboVVoCVW8uGN8XXq+hqx9YIWJDd?=
 =?Windows-1252?Q?DRc5vSUUGi0Vu1Fl/w/7z8QD2dAgEzfO5mpgMxSH5GPGeawCQHShGv6p?=
 =?Windows-1252?Q?lwE/k8rFvukbpf3L2urAfEdKxfxYzI7Bu5YCUBLJmZcHpxrxS11ziJS4?=
 =?Windows-1252?Q?8kbPl6Qh11fws9zyUjSIQAi4JKaCzoUHCy2WSIMLGgS/nJi6mQ8bHm31?=
 =?Windows-1252?Q?s9YP4TDRpO2Tyw=3D=3D?=
arc-seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none;
 b=sQv3Ccu+ffrgXdS9JKLBc2atmbq+ee90C5ndtNYpgPoDdxldh/S6sBrT2mdTUhQAgV2KiV+ZoOOe6jTVwh4Z2SHpgXDaQw/vuhZqRiywKO9fu0lVcnU2RsLgaEkBqIEWTU/aXQ8pqf6QLQPvpEwDgJHGyN2LLHD1IjWNTtuu+X9YUM49C5/X5OsKM4CJj5tichNbB9tpUyHOeL3xZD+B0WMBGM1fv9x1s23hztnM1XdPbzHPtJQoiWcMhjIxUcXsYDLOF572+Xgu0UjUOEZOor+Ac34H2T+OG/SivF/gujlTRKnFEWXd98VDEveIsSnSAe/H2FAf/g7yAQ4i/Dwa3Q==
arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;
 s=arcselector10001;
 h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;
 bh=S3zMzhEi4I51Q2TV4Xq0kyZIJRxS9Pwmo/1nfvl1bwE=;
 b=vkVfYppjto87sj9wKVHbqAYv/vdPZpU6MqNJWMOd1bqXuM43Fg0bkaAtfo61T5WtnEa2g0IES/Pu6Q5x86Bpl2JFYyf7UvedyKQpfVg79JIPM3RYB0455uEcgBet/+JgluIDNqbjJ3XHPc3NFuAWcqYT1xvw3hKwBFZwCaSJixWcsW8dYJqsGAC+3F3+S8qz8DhZR++Yx3avVugeHT2d23ZvtFpMn/fTS9qWfZvMOVIZDd4mt1McRDYd60qaLmx5MBFA51SitOc2HbMuxOVoB8nQqPuLzOqLmEPXxzTgDkJpmc3inLFfCff9pf/GQ5QBcUj9NSlfWr8kODxEm+BycQ==
arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass
 smtp.mailfrom=akamai.com; dmarc=pass action=none header.from=akamai.com;
 dkim=pass header.d=akamai.com; arc=none
x-exchange-routingpolicychecked: 
 HDektnf10TBz4iA43FAiH94545pTW3zohADWQKf2dJaxYWqozR9+4CzP6DMHL3rT3xI7RGv+ALq/RX/kGBN9gm5e6KsgWzUPbR0kMMPADn/Jn1Fh8HQMbO6yq33mALgt9MJP829JdgbpVXaQq4cFHVj7IDBzMdKePrOt2nQNb56h2pgZV2VmOJDO3sd6yKbagAXIAeE1xJnyW8HIvyKRjwyKyQ2gomLpsjfJHUyLEl+SQaCd4po3ktjerfrSWWuCvFtiv9SsFWL1z0kXDsH4z1BZojiRQEADFmfD9/ZGB92y6WPwsl4RAJaMqJvHsbXF7s1jzLHl+xU3tJ3vBa5HUQ==
x-ms-exchange-crosstenant-authas: Internal
x-ms-exchange-crosstenant-authsource: SA1PR17MB4545.namprd17.prod.outlook.com
x-ms-exchange-crosstenant-network-message-id: 
 b35578f5-d7ee-4220-7be3-08def2368106
x-ms-exchange-crosstenant-originalarrivaltime: 04 Aug 2026 14:41:43.9084 (UTC)
x-ms-exchange-crosstenant-fromentityheader: Hosted
x-ms-exchange-crosstenant-id: 514876bd-5965-4b40-b0c8-e336cf72c743
x-ms-exchange-crosstenant-mailboxtype: HOSTED
x-ms-exchange-crosstenant-userprincipalname: 
 tgXFPOYNTHKPUh+LBwYKHS2Yv6hN0RsWY5b4HnOkIijlwciv+p8x2diFOImRu9o6yZ+/hIri3Y+svwbPxFt38A==
x-ms-exchange-transport-crosstenantheadersstamped: SA0PR17MB4457
Content-Type: multipart/alternative;
	boundary="_000_SA1PR17MB45457B57DA60C15AD4DF0514DFD42SA1PR17MB4545namp_"
MIME-Version: 1.0
X-OriginatorOrg: akamai.com
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49
 definitions=2026-08-04_03,2026-08-03_02,2025-10-01_01
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0
 lowpriorityscore=0 bulkscore=0 adultscore=0 malwarescore=0 phishscore=0
 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound
 adjust=0 reason=mlx scancount=1 engine=8.19.0-2606160000
 definitions=main-2608040118
X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA0MDExOCBTYWx0ZWRfX1s/v7opsen/S
 6Sc7rRbVcG/qcDvtFlDP+03p9uYF2TYKmpUThHJTE9FEMVJi8zpnshewX/SX+GWmxEVjKTq3tC/
 JSQMEgspbhNgGlggk/IkWC51+UN7KWStZh5OzcPlxSs5EisKf939xllv21t+5/s3Hu7TAFIDvz7
 rd1OTePxTunw6HHJwdmKPhGTtizUqXho/HktclZ4489Yc8si9MZ0zbldhJ+orpChYMQewiw20dl
 iC8fM5U+mcQHo/XOqP3u6KsJU5hlZweMv3osYUvhn+I5Wue+EbCyvRMCOQt7BoTx+7u91LoFRU8
 UpB7BxEWvXjpdXKvvL8Ll1lGAY3kuaRx++BHw5R3wbax85USWziBZAZbRwlmX8kB/y2UupJYSRk
 jY7l6HBnc2EVKWgHL2+7OCoqvbPVWPZVb1S96xysfRsiMo7IOlWB8LkMVUQiNL0F+Gx6JurQZoY
 I04ii8WVAfZFbcptb8g==
X-Proofpoint-Spam-Info: AW1haW4tMjYwODA0MDExOCBTYWx0ZWRfX5UWdUZZyDe8h
 618dLl3HOw60ZXRJS/o9eshzRYECI3KTUCjXkebVQHOxWsgjO1bCKnQEPjq3DqNuYe+T6avpjy/
 BHnC1RvSyIJ+XUbWKLS65rLv/aydFsg=
X-Proofpoint-GUID: 0OyWpyWYwTkhryrhN9bK1tTLZ9l8t4t0
X-Authority-Analysis: v=2.4 cv=SqigLvO0 c=1 sm=1 tr=0 ts=6a71fa2a cx=c_pps
 a=YfDTZII5gR69fLX6qI1EXA==:117 a=YfDTZII5gR69fLX6qI1EXA==:17
 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=Sv0fKeRqtYgA:10
 a=VkNPw1HP01LnGYTKEx00:22 a=Ifg-1AOnLHOf1gn6spyb:22 a=KDzEjHMMTas96-nIEKpj:22
 a=NEAV23lmAAAA:8 a=88TS1XBXAAAA:8 a=toprYVvBDR30jBGhFBoA:9
 a=qcg49hLlgF0N60+LroqrWnV/Vu4=:19 a=pILNOxqGKmIA:10 a=pDCPamyJXRxgXY-MkxUA:9
 a=5rH6NyYlanfcrGjg:21 a=_W_S_7VecoQA:10 a=Zvziu4uLN1TumuYL5BLv:22
X-Proofpoint-ORIG-GUID: 0OyWpyWYwTkhryrhN9bK1tTLZ9l8t4t0
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49
 definitions=2026-08-04_03,2026-08-03_02,2025-10-01_01
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0
 lowpriorityscore=0 adultscore=0 priorityscore=1501 impostorscore=0
 phishscore=0 bulkscore=0 clxscore=1015 malwarescore=0 spamscore=0
 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc=
 route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606160001
 definitions=main-2608040118
Message-ID-Hash: HIAXJ7TFVUJJ5CDQLUK574IC4KCBFBW6
X-Message-ID-Hash: HIAXJ7TFVUJJ5CDQLUK574IC4KCBFBW6
X-MailFrom: wilaw@akamai.com
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency;
 loop; banned-address; member-moderation; nonmember-moderation; administrivia;
 implicit-dest; max-recipients; max-size; news-moderation; no-subject;
 digests; suspicious-header
X-Mailman-Version: 3.3.9rc6
Precedence: list
Subject: =?utf-8?q?=5BMoq=5D_Sender_Side_Track_Switching_=28SSTS=29?=
List-Id: Media over QUIC <moq.ietf.org>
Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/moq/SvmxqBe4LD6bJyhEU259k6X84ro>
List-Archive: <https://mailarchive.ietf.org/arch/browse/moq>
List-Help: <mailto:moq-request@ietf.org?subject=help>
List-Owner: <mailto:moq-owner@ietf.org>
List-Post: <mailto:moq@ietf.org>
List-Subscribe: <mailto:moq-join@ietf.org>
List-Unsubscribe: <mailto:moq-leave@ietf.org>

--_000_SA1PR17MB45457B57DA60C15AD4DF0514DFD42SA1PR17MB4545namp_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Based on feedback received at Vienna, I have reformatted PR 'Add Sender-Sid=
e Track Switching (SSTS)=92 #1638<https://github.com/moq-wg/moq-transport/p=
ull/1638> as an external draft, which defines an extension to MOQT to enabl=
e Sender-Side Track Switching.

HTML: https://wilaw.github.io/moqt-ssts/draft-wilaw-moq-moqt-ssts.html
Repo: https://github.com/wilaw/moqt-ssts
Issues: https://github.com/wilaw/moqt-ssts/issues

The default publisher algorithm has been updated and improved, along with t=
he prose. A security considerations section has been added, along with IANA=
 actions.

Currently, the extension defines a base mechanism for supporting multiple s=
witching algorithms and then also defines an instance of one of these algor=
ithms, which is termed algorithm 0. One suggestion at Vienna was that we co=
uld place the base definition for SSTS into the core MOQT spec and then mov=
e all algorithms into external drafts. Input on this direction is appreciat=
ed.

I am requesting review, ahead of publishing an I-D draft and hopefully pres=
entation time at a virtual interim.

Cheers
Will

---------------------------------------------------------
Chief Architect - Cloud Technology Group
Akamai Technologies
Switzerland
Mobile +41 79 535 07 94


--_000_SA1PR17MB45457B57DA60C15AD4DF0514DFD42SA1PR17MB4545namp_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Based on feedback received at Vienna, I have reformatted PR 'Add Sender-Sid=
e Track Switching (SSTS)=92
<a href=3D"https://github.com/moq-wg/moq-transport/pull/1638" data-outlook-=
id=3D"a39c9ad7-880b-4e87-954d-c8bddfa74238">
#1638</a>&nbsp;as an external draft, which defines an extension to MOQT to =
enable Sender-Side Track Switching.</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
HTML: <a href=3D"https://wilaw.github.io/moqt-ssts/draft-wilaw-moq-moqt-sst=
s.html" data-outlook-id=3D"d2dcd9c2-b3a7-4d93-a8ca-c395767af8eb">
https://wilaw.github.io/moqt-ssts/draft-wilaw-moq-moqt-ssts.html</a></div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Repo: <a href=3D"https://github.com/wilaw/moqt-ssts" data-outlook-id=3D"3bd=
b2cad-323d-40f0-9b36-d18f812426fc">
https://github.com/wilaw/moqt-ssts</a></div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Issues: <a href=3D"https://github.com/wilaw/moqt-ssts/issues" data-outlook-=
id=3D"a999e6c5-7989-453f-8d42-ee211c6dec40">
https://github.com/wilaw/moqt-ssts/issues</a></div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
The default publisher algorithm has been updated and improved, along with t=
he prose. A security considerations section has been added, along with IANA=
 actions.</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Currently, the extension defines a base mechanism for supporting multiple s=
witching algorithms and then also defines an instance of one of these algor=
ithms, which is termed algorithm 0. One suggestion at Vienna was that we co=
uld place the base definition for
 SSTS into the core MOQT spec and then move all algorithms into external dr=
afts. Input on this direction is appreciated.&nbsp;</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
I am requesting review, ahead of publishing an I-D draft and hopefully pres=
entation time at a virtual interim.&nbsp;</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Cheers</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
Will</div>
<div style=3D"direction: ltr; font-family: Aptos, Arial, Helvetica, sans-se=
rif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"ms-outlook-mobile-signature">
<div class=3D"MsoNormal" style=3D"margin: 0in; font-family: Calibri, sans-s=
erif; font-size: 11pt;">
---------------------------------------------------------</div>
<div class=3D"MsoNormal" style=3D"margin: 0in; font-family: Calibri, sans-s=
erif; font-size: 11pt;">
Chief Architect - Cloud Technology Group</div>
<div class=3D"MsoNormal" style=3D"margin: 0in; font-family: Calibri, sans-s=
erif; font-size: 11pt;">
Akamai Technologies</div>
<div class=3D"MsoNormal" style=3D"margin: 0in; font-family: Calibri, sans-s=
erif; font-size: 11pt;">
Switzerland</div>
<div class=3D"MsoNormal" style=3D"margin: 0in; font-family: Calibri, sans-s=
erif; font-size: 11pt;">
Mobile &#43;41 79 535 07 94</div>
<div class=3D"MsoNormal" style=3D"direction: ltr; margin: 0in; font-family:=
 Calibri, sans-serif; font-size: 11pt;">
<br>
</div>
<div class=3D"MsoNormal" style=3D"direction: ltr; margin: 0in; font-family:=
 Calibri, sans-serif; font-size: 11pt;">
<br>
</div>
</div>
</body>
</html>

--_000_SA1PR17MB45457B57DA60C15AD4DF0514DFD42SA1PR17MB4545namp_--