/mcpEvents Action For A: CONNECTED reason = DIRECT ExtendedCallReason = DIRECT CONFERENCED Calling = A, Called = B, Connected = B CONFERENCED Calling = A, Called = C, Connected = C For B: CONNECTED reason = DIRECT ExtendedCallReason = DIRECT CONFERENCED Calling = A, Called = B, Connected = A CONFERENCED Calling = B, Called = C, Connected = C For C CONNECTED Reason = UNKNOWN ExtendedCallReason = ClickToConference CONFERENCED Calling = C, Called = A, Connected = A CONFERENCED Calling = C, Called = B, Connected = B Use Click-2-Conference feature to add C into conference, and C answers Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 547 Message Sequence Charts Message Sequence Charts