付録A H.323システム標準の進化
ITU-T H.323ファミリー標準の進化を，H.323本体と関連勧告に分けて示します．各勧告の主要内容を（）内に記しています．H.323システムのバージョンnは本文第9.4節 6)の図9-12に従い，関連するH.225.0のバージョンnおよびH.245のバージョンm以上をサポートすることで決定されます．
| 承認時期 | H.323本体 | 関連勧告 |
|---|---|---|
| 1996/03 | H.245 v1 | |
| 1996/11 | v1 | H.225.0 v1 |
| 1997/07 | H.245 v2 | |
| 1998/02 | v2 (v1 defects removal，fast connect， H.245 tunneling) |
H.225.0 v2 |
| Annex B (Layered coding) | H.245 v3 | |
| Annex C (Use of ATM) | H.235 (Security) | |
| H.246 (H.323-H.320 Interworking) | ||
| 1998/09 | Annex D (Realtime FAX) | H.245 v4 |
| H.332 (Loosely coupled conference) | ||
| H.450.1, 2, 3 (Supplementary services) | ||
| 1999/05 | Annex E (Call control signaling over UDP) | H.225.0 Annex G (Interdomain communication) |
| Annex F (Black telephone SET) | H.245 v5 | |
| H.341 (MIB) | ||
| H.450.4-7 (Supplementary services) | ||
| 1999/09 | v3 (Clarifications based on implementations) | H.225.0 v3 |
| 2000/02 | Annex G (Text SET) | H.245 v6 |
| H.246 Annex C (Interworking with ISUP) | ||
| H.450.8 (Supplementary service) | ||
| 2000/06 | H.248 (Media GW control protocol) | |
| 2000/11 | v4 (Distributed GW architecture, GEF, enhancements by the following annexes) |
H.225.0 v4 |
| Annex J (Security SET) | H.245 v7 | |
| Annex K (Service control by http) | H.235 v2 | |
| Annex M.1 (QSIG tunneling) | H.246 Annex E1, E2 (mobile network) | |
| Annex M.2 (ISUP tunneling) | H.450.9 (Supplementary service) | |
| 2001/02 | Annex L (Stimulus signalling) | H.450.10, 11 (Supplementary services) |
| 2001/07 | Annex M.3 (DSS1 tunneling) | H.245 v8 |
| Annex Q (FECC) | H.246 Annex F (H.323 - H.324 interworking) | |
| Annex R (Robustness) | H.450.12 (Supplementary service) | |
| H.460.2 (Number portability) | ||
| 2002/03 | H.510 (H.323 mobility) | H.248 v2 (Correction of v1 defects + new functionalities) |
| H.460.1 (Guideline for the usage of GEF) | ||
| H.501 (mobility management & intra/inter domain communication control) |
||
| H.530 (H.510 security) | ||
| 2003/01 | Annex P (Modem over IP) | H.225.0 Annex G v2 |
| H.460.3 (Circuit maps) | ||
| H.460.4 (Call priority) | ||
| H.460.5 (H.225.0 transport of multiple Q.931 information) |
||
| H.460.6 (Extended fast connect) | ||
| H.460.7 (Digit maps) | ||
| H.460.8 (Querying for alternate routes) | ||
| H.460.9 (On-line QoS monitoring reporting) | ||
| 2003/02 | H.245 v9 | |
| 2003/07 | v5 (Correction of v4 defects + new functionalities) |
H.225.0 v5 |
| Annex O (Use of URLs and DNS) | H.245 v10 | |
| H.235 v3 | ||
| H.239 (Dual video) | ||
| H.241 (Extended video procedures) | ||
| H.350, H.350.1-5 (Directory services architecture) | ||
| 2004/03 | H.460.10 (Call party category) | |
| H.460.11 (Delayed call establishment) | ||
| H.460.12 (Glare control indicator) | ||
| H.460.13 (Called user release control) | ||
| H.460.14 (Support for MLPP) | ||
| H.460.15 (Call signalling transport channel suspension and redirection) |
||
| H.350.6 (Directory services) | ||
| 2005/01 | Annex D v3 (Real-time fax) | H.245 v11 |
| Annex M.4 (NSS tunneling) | H.235 Annex G (MIKEY for RSTP) | |
| H.460.16 (Multiple message release) | ||
| 2005/09 | H.245 v12 | |
| H.235.0-9 (Rearranged security series) | ||
| H.239 v2(dual video) | ||
| H.241 v2 | ||
| H.248.1 v3 (Gateway control protocol, main body) |
||
| H.460.17 (RAS over call signaling) | ||
| H.460.18, 19 (NAT/firewall traversal) | ||
| H.460.20 (Location number) | ||
| 2006/05 | v6 (Correction of v5 defects + new functionalities such as updated alternate GK procedure) |
H.225.0 v6 |
| H.245 v13 | ||
| H.361 (QoS signaling in H.323) | ||
| H.241 v3 | ||
| H.246 v2 (Interworking) | ||
| H.249 (Extended user input indications) | ||
| H.460.21 (Message broadcast) | ||
| 2007/01 | H.350.7 (Directory Services Architecture for XMPP) |
|
| H.460.22 (Security procedures negotiation) | ||
| 2008/06 | H.245 v14 | |
| H.351 (Semantic Web Interface) | ||
| 2009/12 | v7 (Correction of v6 defects + new functionalities such as conference list provision from MCU to terminal, calling party information in multiple languages, allowing Common Alerting Protocol message delivery) |
H.225.0 v7 H.245 v15 |
| H.460.23 (Discovery of NAT/FW type) | ||
| H.460.24 (Direct point-to-point media transfer) | ||
| 2010/09 | H.460.25 (Transport of geographic info) | |
| 2011/05 | H.245 v16 | |
| H.241v4 (Video procedures) | ||
| 2012/06 | H.460.26 (Using H.225.0 CS connection as transport for media) |
|
| 2014/10 | H.239 v3 | |
| H.420 (Telepresence system architecture) | ||
| 2015/04 | H.460.22 v2 | |
| 2015/11 | H.460.27 (End-to-end session ID) | |
| 2017/01予定 | H.323 v8 | H.225.0 v8 |
| H.245 v17 |
DNS: Domain Name System（ドメイン名前解決システム）
DSS1: Digital Subscriber Signalling System No. 1
FECC: Far End Camera Control（遠隔カメラ制御）
GEF: Generic Extensibility Framework（汎用機能拡張方式）
GW: Gateway（ゲートウェイ）
ISUP: ISDN User Parts of Signalling System number 7
MIB: Management Information Base（管理情報ベース）
MIKEY: Multimedia Internet Keying
MLPP: Multi-level Precedence and Preemption
NAT: Network Address Translation
NSS: Narrowband Signalling Syntax
QSIG: Signalling between the Q reference points
RAS: Registration, Admission, and Status（登録，通信許可および通信状態）
RTSP: Real Time Streaming Protocol
SET: Simple Endpoint Types（単機能端末）
URL: Uniform Resource Locator
V: Version（版）