SRVCC关键场景及Log分析

SRVCC（Single Radio Voice Call Continuity）是VoLTE跟CS域语音业务连续性方案。

SRVCC触发场景

呼叫保持过程中SRVCC ：Hold call (mid-call SRVCC)

会议通话过程中SRVCC：Conference call (mid-call SRVCC)

呼叫对方振铃时SRVCC：Alerting call (aSRVCC)

呼叫过程中SRVCC：Pre-alerting call (bSRVCC)

SRVCC能力确认

UE侧：检查invite消息中contact header

关键Log

Contact:sip:+14167790413@[2605:b100:82c:b48a:0:15:29ab:5101]:5060;transport=tcp;

+sip.instance="imei:01568300-000202-0>";

+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";audio;+g.3gpp.mid-call;+g.3gpp.srvcc-alerting

UE support: SRVCC /alerting SRVCC and mid-call SRVCC;

网络侧: 检查183或者180消息中Feature-Caps header

关键Log

m:;+g.3gpp.icsi-ref="