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The Hangup Cause describes in details what caused the hangup. Possible causes are:
- NO_ROUTE_DESTINATION: The callee is not reachable because of network issues.
- NORMAL_CLEARING: Call closed normally.
- USER_BUSY: The user is busy.
- NO_ANSWER: The callee didn't answer and the call was closed for timeout reason.
- CALL_REJECTED: The callee rejected the call, as by pressing the "hold" button.
- BEARERCAPABILITY_NOTAVAIL: The caller and the callee were using different security models that are not compatible.
- NO_USER_RESPONSE: The same as in "NO_ANSWER", but this happens when the call goes out by Trunk.
The Call Type identifies the nature of the call. Used with the Call id fields this value is useful to trace down complex calls like three-way calls, conferences or transferred calls. Possible values are:
- CALL: Usual call between two persons
- 3-WAY: Usual call (as above) with an added person during the call
- CONFERENCE: Conference call
- TRANSFER
:: Usual call that is transferred to a third person
The Call id is a number that identifies uniquely the call. It can be used to trace a call if it changes its nature (ie becoming a three-way call) or to group all the participants (ie in a conference room).
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