9 One CT1 meeting, by the numbers

9.1 The rhythm

CT1 has 184 meetings listed, held and planned together ^[1].

172 of them had started by 2026-08-04 ^[2], and the earliest one the meetings database holds started 2005-04-25 ^[3]. That is where the store begins and not where CT1 begins: the group grew out of CN1 CT1 — Mobility, call control, session management (WG1_mm-cc-sm_ex-CN1), and earlier meetings existed without being in this data. 133 meetings have documents attached to them ^[4].

The last six held and the next three planned show the shape of a year:

Meeting	Dates	Where	State
C1-156	2025-08-25 to 2025-08-29	Gothenburg Metropolitan Area	held C1-156
C1-157	2025-10-13 to 2025-10-17	Sophia-Antipolis	held C1-157
C1-158	2025-11-17 to 2025-11-21	Dallas	held C1-158
C1-159	2026-02-09 to 2026-02-13	India	held C1-159
C1-160	2026-04-13 to 2026-04-17	Valletta	held C1-160
C1-161	2026-05-18 to 2026-05-22	China	held C1-161
C1-162	2026-08-24 to 2026-08-28	Prague	planned C1-162
C1-163	2026-10-12 to 2026-10-16	Prague	planned C1-163
C1-164	2026-11-16 to 2026-11-20	Calgary	planned C1-164

Every one of those runs Monday to Friday, five days. That is visible in the dates and nowhere else in the data — no schedule, no agenda and no session plan is in the register.

The locations move around the world and are recorded at whatever precision the calendar used: "Dallas" and "Valletta" are cities, "India" and "China" are countries, "Gothenburg Metropolitan Area" is neither.

9.2 How much arrives

617 documents were put to C1-161 ^[5], and 172 people are listed as taking part ^[6].

Those two numbers together are the whole problem of a working group meeting. Between them the participants have to reach a common position on all 617 documents ^[5], in five days, without a vote.

The meeting before it, C1-160, lists 165 participants ^[7].

Those are the only two attendance figures that exist anywhere in this data, so no trend can be described from them — that limit and the reason for it are in What this record cannot tell you.

9.3 What came out of C1-161

C1-161, held 2026-05-18 to 2026-05-22 C1-161, is the last meeting with both a report and a full document record ^[8].

Each of its 617 documents carries an outcome word:

Outcome	How many
revised	259 [9]
agreed	174 [10]
postponed	70 [11]
noted	53 [12]
merged	33 [13]
withdrawn	19 [14]

Two things about that table are worth more than the numbers in it.

More documents were revised than agreed. A revision comes back with a new number, so the same problem occupies several document numbers before it settles. A count of documents is not a count of problems solved.

The six do not add up to 617. Two further outcome words appear in the data, "approved" and "endorsed", and the register carries no count for either. The remainder therefore cannot be recovered by subtraction, and nothing in this course does so.

9.4 The new work agreed at C1-161

Nine new or revised work items were agreed at that meeting ^[16], against five at C1-160 ^[17].

A WID is a work item description, the document that opens a piece of work; a SID is a study item description, which opens a study instead.

The nine, each with the company that brought it:

• New WID on CT aspects of Ambient power-enabled Internet of Things – Phase 2, from Huawei, HiSilicon C1-262440

• New WID on CT aspects of ProSe Phase 4, from NIST C1-262442

• New WID on CT aspects of Short Message Service to Emergency Response Centre, from Apple (Guizhou) C1-262554

• New SID on Protocol Enhancements for Emergency Call Robustness, from Google C1-262596

• New WID on Protocol development for Enhanced MC Features Phase 2, from UK Home Office C1-262597

• New SID on miscellaneous functions and services for 6G System, from OPPO and Qualcomm Incorporated C1-262610

• New WID on Next Generation Real time Communication services Phase 3, from China Mobile C1-262611

• New WID on CT aspects for integration of satellite components in the 5G Phase 4, from CATT and vivo C1-262612

• New WID on CT aspects for application enablement aspects for MMTel Phase 2, from China Mobile Com. Corporation C1-262617

Two things stand out of that list. Six of the nine carry "Phase 2", "Phase 3" or "Phase 4" in the title, so most new work at that meeting was a continuation rather than a fresh subject.

And the filers are not all equipment makers: NIST, the UK Home Office and Google appear beside Huawei, HiSilicon, CATT and China Mobile.

C1-160 agreed five in the same way C1-261459, C1-261460, C1-261599, C1-261602, C1-261603. Two of those five carry titles that turn up again at C1-161 — the ambient IoT phase 2 work item, and the study item on 6G, the second time under different filers.

9.5 What one agreed change request looks like

Seven agreed change requests from C1-161 are in the register, one for each specification that meeting changed most:

Document	Changes	From
C1-262074	TS 24.501	Nokia C1-262074
C1-262254	TS 24.301	SHARP C1-262254
C1-262227	TS 24.369	Nokia C1-262227
C1-262258	TS 24.554	SHARP C1-262258
C1-262144	TS 24.548	Huawei, HiSilicon C1-262144
C1-262343	TS 24.558	Huawei, HiSilicon C1-262343
C1-262064	TS 24.379	Ericsson C1-262064

All seven carry the word "correction" in their title.

That is seven documents out of 2835 change requests in the year ^[18], so it says nothing about the rest — but it does show the texture of an ordinary agreed CR, and the path one of them takes afterwards is traced in From a document number to a published version.

9.6 The next meeting has already started collecting

69 documents are already filed under C1-162 ^[19], a meeting planned for 2026-08-24 C1-162. The newest CT1 document on record was uploaded 2026-07-31 at 10:40:59, and it is one of them ^[20].

That is what makes the freshness of this data easy to state: the record is current to within days, and it already contains paperwork for a meeting that has not happened. Nothing about C1-162 or any later meeting may be described as decided, agreed or postponed, because nobody has met yet.

It also shows the rhythm between meetings. C1-161 ended on 2026-05-22 C1-161 and C1-162 begins on 2026-08-24 C1-162.

That is three months in which 69 documents have already been filed ^[19]. The meeting is where documents get an outcome word, not where the work is done.

9.7 Where this meets the rest of the course

What the meeting is spending its time on across a whole year is The work items that fill a CT1 year. Who it writes to between meetings is Who CT1 writes to, and what the letters count. How to find any of these documents yourself is Following CT1 yourself.