/mcp3XX Application monitors B. Table 27: 3XX CallState/CallInfo @Refer-to-Target (C) CallState/CallInfo @Referree (B) CallState/CallInfo @Referrer (A) Actions TSPI: LINE_APPNEWCALL Reason = LINECALL REASON_REDIRECT A calls external phone that is running SIP, which has CFDUNC set to B Agent Greeting Configuration Customer Phone—IP Phone A with DN 1001. Agent Phone—IP Phone B with DN 1002. Agent Phone—IP Phone C with DN 1002 (shared line) Supervisor Phone—IP Phone D with DN 1003. IVR1—with DN 5555 IVR2—with DN 6666 Procedure Application monitoring all lines on all devices. New extension is negotiated when application opens lines. SRTP is also supported at IVR side, can be variation of following use cases. Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 455 Message Sequence Charts 3XX