单项选择题
A.Tcl B.telephony C.application D.IP-telephony E.telephony-service
A.e-mail and voice-mail message integration B.voice-mail and instant message integration C.email, voice-mail and instant message integration D.voice-mail messages may be sent by email E.voice-mail messages may be received by email
A.auto-setup B.auto assign C.no telephony-service D.auto telephony-service E.telephony-service auto F.telephony-service setup