TAPI messages CTI messages Action B: LINE_APPNEWCALL, LINE_CALLSTATE (LINECALLSTATE_DIALTONE/ LINECALLSTATE_DIALING) B: LINE_APPNEWCALL, LINE_CALLSTATE (LINECALLSTATE_DIALTONE/ LINECALLSTATE_DIALING) LINECALLINFO.dwCallID = 0x00400BBA LINECALLINFO.dwOrigin = 0x00000001 LINECALLINFO.dwReason=0x00000001 LINECALLINFO.dwCallerID = 1901(B) LINECALLINFO.dwCallerIDName = LINECALLINFO.dwCalledID = 1000: LINECALLINFO.dwCalledIDName = CCD Pattern LINECALLINFO.dwConnectedID = 1000(C) LINECALLINFO.dwConnectedIDName

LINECALLINFO.dwRedirectionID = 1000 LINECALLINFO.dwRedirectionIDName

LINECALLINFO.dwRedirectingID = 1000 LINECALLINFO.dwRedirectingIDName = CCD Pattern Extendedcallreason = CtiReasonSAF_CCD_PSTNFailover B: LINE_CALLSTATE (LINECALLSTATE_DISCONNECTED) ExtendCallReason = CtiReasonTransferredCall B(1901) setups transfer to C(1000) This call first will be intercepted by CCD Requesting Feature, and CCD Requesting feature will extend this call to SIP trunk SIP trunk rejects this call due to no more bandwidth available CCD Requesting feature will start PSTN failover by directing this caller to 1000’s PSTN failover number, i.e. 14089721000. Call is sent out to a PSTN GW. TSPI_linegetcallinfo on Consult call on B with C. B completes transfer Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 488 Message Sequence Charts Message Sequence Charts