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中国电信H248协议标准
目录
1范围 ................................................................................................................................ 7
2 引用标准 ......................................................................................................................... 7
3 定义 ................................................................................................................................ 7
4 缩略语 ............................................................................................................................. 8
5 协议在网络中的位置 ..................................................................................................... 9
6 连接模型 ....................................................................................................................... 10
6.1 关联....................................................................................................................................11
6.1.1 关联属性........................................................................................................................... 11
6.1.2 关联的创建、删除和修改............................................................................................... 12
6.2 终结点............................................................................................................................... 12
6.2.1 终结点的动态性............................................................................................................... 14
6.2.2 终结点标识符TerminationID .......................................................................................... 14
6.2.3 包(Package).................................................................................................................. 15
6.2.4 终结点的属性和描述符................................................................................................... 15
6.2.5 根终结点(Root) ........................................................................................................... 17
7 命令 ............................................................................................................................... 17
7.1 描述符............................................................................................................................... 18
7.1.1 参数的指定....................................................................................................................... 18
7.1.2 Modem 描述符.................................................................................................................. 18
7.1.3 复用描述符(Mux)........................................................................................................ 18
7.1.4 媒体描述符(Media)..................................................................................................... 18
7.1.5 终结点状态描述符(TerminationState)........................................................................ 19
7.1.6 流描述符(Stream)........................................................................................................ 19
7.1.7 本地控制描述符(LocalControl).................................................................................. 19
7.1.8 本地和远端描述符(Local 和Remote)........................................................................ 20
7.1.9 事件描述符(Events) .................................................................................................... 22
7.1.10 事件缓存描述符(EventBuffer).................................................................................... 22
7.1.11 信号描述符(Signals) ................................................................................................... 23
7.1.12 审计描述符(Audit)...................................................................................................... 24
7.1.13 业务改变描述符(ServiceChange) ............................................................................... 24
7.1.14 号码表描述符(DigitMap)............................................................................................ 24
7.1.15 统计描述符(Statistics)................................................................................................. 27
7.1.16 包描述符(Packages) .................................................................................................... 28
7.1.17 被观察事件描述符(ObservedEvents) ......................................................................... 28
7.1.18 拓扑描述符(Topology)................................................................................................ 28
7.1.19 错误描述符(Error)....................................................................................................... 29
7.2 命令 API............................................................................................................................ 30
7.2.1 Add................................................................................................................................... 30
7.2.2 Modify.............................................................................................................................. 31
7.2.3 Subtract............................................................................................................................. 31
7.2.4 Move................................................................................................................................. 32
7.2.5 AuditValue........................................................................................................................ 33
7.2.6 AuditCapabilities.............................................................................................................. 35
7.2.7 Notify................................................................................................................................ 35
7.2.8 ServiceChange.................................................................................................................. 36
中国电信H.248 协议标准
4
7.2.9 关联属性的处理和审计................................................................................................... 38
7.2.10 通用命令语法................................................................................................................... 39
7.3 命令错误码........................................................................................................................ 39
8 事务(TRANSACTION).......................................................................................... 41
8.1 公共参数............................................................................................................................ 42
8.1.1 TransactionID .................................................................................................................... 42
8.1.2 ContextID .......................................................................................................................... 42
8.2 事务 API............................................................................................................................ 42
8.2.1 TransactionRequest ........................................................................................................... 43
8.2.2 TransactionReply............................................................................................................... 43
8.2.3 TransactionPending ........................................................................................................... 44
8.3 消息................................................................................................................................... 44
9 协议传送 ....................................................................................................................... 45
9.1 命令执行的顺序................................................................................................................ 45
9.2 预防重启雪崩.................................................................................................................... 45
10 安全 ............................................................................................................................... 46
10.1 保护协议连接.................................................................................................................... 46
10.2 过渡性 AH 方案................................................................................................................ 46
10.3 保护媒体连接.................................................................................................................... 47
11 MG-MGC 的控制接口................................................................................................ 47
11.1 多虚拟 MG........................................................................................................................ 47
11.2 冷启动............................................................................................................................... 48
11.3 协议版本协商.................................................................................................................... 48
11.4 MG 故障............................................................................................................................ 49
11.5 MGC 故障......................................................................................................................... 49
11.6 心跳机制............................................................................................................................ 49
11.6.1 只有MGC 控制的心跳消息............................................................................................ 50
11.6.2 MGC 和MG 分别独立控制的心跳消息......................................................................... 50
11.7 MGC-MG 控制连接中断业务处理建议......................................................................... 50
11.7.1 MGC 检测到中断............................................................................................................. 50
11.7.2 MG 检测到中断................................................................................................................ 50
11.8 MGC-MG 控制连接中断后又恢复的处理建议............................................................. 51
11.8.1 MGC 检测到恢复............................................................................................................. 51
11.8.2 MG 检测到恢复................................................................................................................ 51
11.9 超长通话的审计................................................................................................................ 51
12 包的定义 ....................................................................................................................... 51
12.1 包定义规则........................................................................................................................ 52
12.1.1 包(Package).................................................................................................................. 52
12.1.2 属性(Property) ............................................................................................................. 52
12.1.3 事件(Events) ................................................................................................................ 53
12.1.4 信号(Signals) ............................................................................................................... 53
12.1.5 统计(Statistics)............................................................................................................. 53
12.1.6 程序(Procedures) ......................................................................................................... 54
12.2 事件(EVENTS)和信号(SIGNALS)