Platform SDK: TAPI |
The possible reasons for an incoming session, such as that it was transferred, are listed in the LINECALLREASON_ Constants.
Not all service providers support use of this information.
TAPI 2: lineGetCallInfo (dwReason member of lpCallInfo)
TAPI 3: ITCallInfo::get_CallInfoLong (CIL_REASON member of CALLINFO_LONG)