A.CSCF
B.ENUM/DNS
C.统一Centrex AS
D.固网IMS HSS

A.接入无关
B.归属地控制
C.多业务提供能力
D.全IP承载

A.VoLTE SCC AS
B.VoLTE AS
C.IP-SM-GW
D.统一Centrex AS

A.VoLTE AS
B.ENUM/DNS
C.统一Centrex AS
D.CSCF

A.P-CSCF
B.S-CSCF
C.ENUM/DNS
D.TAS

A.SRVCC切换信令锚定点
B.号码翻译
C.T-ADS
D.锚定功能

A.锚定
B.域选
C.CSRN查询
D.ENUM查询

A.P-CSCF
B.I-CSCF
C.S-CSCF
D.HSS

A.MSC
B.P-GW
C.VoLTE AS
D.MME

A.视频承载
B.音频承载
C.GBR承载
D.non-GBR承载

A.语音/视频按时长计费，流量减免，发生eSRVCC切换费率不变
B.VoLTE用户IP短信需按条计费，或按流量计费
C.彩铃业务收取功能费和信息费，流量减免
D.彩铃业务收取流量费