来电与去电汇合

flowchart TD
Incoming["IncomingIdentifying"] --> Ring["IncomingRinging"]
Ring --> Accept{"accept?"}
Accept -- 否 --> End["Ended"]
Accept -- 是 --> Start["AcceptedStarting"]
Outgoing["Outgoing"] --> Start
Start --> Ready{"link + exclusive + media ready?"}
Ready -- 是 --> Active["ActiveCall"]
Ready -- 失败 --> Failed["Failed"]
Active --> End