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The Hangup Cause describes ...in details what caused the hangup. Possible causes are:
- NO_ROUTE_DESTINATION
- MISDIALLED_TRUNK_PREFIX
- CHANNEL_UNACCEPTABLE
- CALL_AWARDED_DELIVERED
- PRE_EMPTED
- NUMBER_PORTED_NOT_HERE
- NORMAL_CLEARING
- USER_BUSY
- NO_USER_RESPONSE
- NO_ANSWER
- SUBSCRIBER_ABSENT
- CALL_REJECTED
- NUMBER_CHANGED
- REDIRECTED_TO_NEW_DESTINATION
- ANSWERED_ELSEWHERE
- DESTINATION_OUT_OF_ORDER
- INVALID_NUMBER_FORMAT
- FACILITY_REJECTED
- RESPONSE_TO_STATUS_ENQUIRY
- NORMAL_UNSPECIFIED
- NORMAL_CIRCUIT_CONGESTION
- NETWORK_OUT_OF_ORDER
- NORMAL_TEMPORARY_FAILURE
- SWITCH_CONGESTION
- ACCESS_INFO_DISCARDED
- REQUESTED_CHAN_UNAVAIL
- FACILITY_NOT_SUBSCRIBED
- OUTGOING_CALL_BARRED
- INCOMING_CALL_BARRED
- BEARERCAPABILITY_NOTAUTH
- BEARERCAPABILITY_NOTAVAIL
- BEARERCAPABILITY_NOTIMPL
- CHAN_NOT_IMPLEMENTED
- FACILITY_NOT_IMPLEMENTED
- INVALID_CALL_REFERENCE
- INCOMPATIBLE_DESTINATION
- INVALID_MSG_UNSPECIFIED
- MANDATORY_IE_MISSING
- MESSAGE_TYPE_NONEXIST
- WRONG_MESSAGE
- IE_NONEXIST
- INVALID_IE_CONTENTS
- WRONG_CALL_STATE
- RECOVERY_ON_TIMER_EXPIRE
- MANDATORY_IE_LENGTH_ERROR
- PROTOCOL_ERROR
- INTERWORKING
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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