Asterisk - The Open Source Telephony Project GIT-master-2070bb5
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The Asterisk hangup causes are delivered to the dialplan in the ${HANGUPCAUSE} channel variable after a call (after execution of "dial").
In SIP, we have a conversion table to convert between SIP return codes and Q.931 both ways. This is to improve SIP/ISDN compatibility.
These are the current codes, based on the Q.850/Q.931 specification:
- AST_CAUSE_UNALLOCATED 1 - AST_CAUSE_NO_ROUTE_TRANSIT_NET 2 - AST_CAUSE_NO_ROUTE_DESTINATION 3 - AST_CAUSE_MISDIALLED_TRUNK_PREFIX 5 - AST_CAUSE_CHANNEL_UNACCEPTABLE 6 - AST_CAUSE_CALL_AWARDED_DELIVERED 7 - AST_CAUSE_PRE_EMPTED 8 - AST_CAUSE_NUMBER_PORTED_NOT_HERE 14 - AST_CAUSE_NORMAL_CLEARING 16 - AST_CAUSE_USER_BUSY 17 - AST_CAUSE_NO_USER_RESPONSE 18 - AST_CAUSE_NO_ANSWER 19 - AST_CAUSE_CALL_REJECTED 21 - AST_CAUSE_NUMBER_CHANGED 22 - AST_CAUSE_REDIRECTED_TO_NEW_DESTINATION 23 - AST_CAUSE_ANSWERED_ELSEWHERE 26 - AST_CAUSE_DESTINATION_OUT_OF_ORDER 27 - AST_CAUSE_INVALID_NUMBER_FORMAT 28 - AST_CAUSE_FACILITY_REJECTED 29 - AST_CAUSE_RESPONSE_TO_STATUS_ENQUIRY 30 - AST_CAUSE_NORMAL_UNSPECIFIED 31 - AST_CAUSE_NORMAL_CIRCUIT_CONGESTION 34 - AST_CAUSE_NETWORK_OUT_OF_ORDER 38 - AST_CAUSE_NORMAL_TEMPORARY_FAILURE 41 - AST_CAUSE_SWITCH_CONGESTION 42 - AST_CAUSE_ACCESS_INFO_DISCARDED 43 - AST_CAUSE_REQUESTED_CHAN_UNAVAIL 44 - AST_CAUSE_FACILITY_NOT_SUBSCRIBED 50 - AST_CAUSE_OUTGOING_CALL_BARRED 52 - AST_CAUSE_INCOMING_CALL_BARRED 54 - AST_CAUSE_BEARERCAPABILITY_NOTAUTH 57 - AST_CAUSE_BEARERCAPABILITY_NOTAVAIL 58 - AST_CAUSE_BEARERCAPABILITY_NOTIMPL 65 - AST_CAUSE_CHAN_NOT_IMPLEMENTED 66 - AST_CAUSE_FACILITY_NOT_IMPLEMENTED 69 - AST_CAUSE_INVALID_CALL_REFERENCE 81 - AST_CAUSE_INCOMPATIBLE_DESTINATION 88 - AST_CAUSE_INVALID_MSG_UNSPECIFIED 95 - AST_CAUSE_MANDATORY_IE_MISSING 96 - AST_CAUSE_MESSAGE_TYPE_NONEXIST 97 - AST_CAUSE_WRONG_MESSAGE 98 - AST_CAUSE_IE_NONEXIST 99 - AST_CAUSE_INVALID_IE_CONTENTS 100 - AST_CAUSE_WRONG_CALL_STATE 101 - AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE 102 - AST_CAUSE_MANDATORY_IE_LENGTH_ERROR 103 - AST_CAUSE_PROTOCOL_ERROR 111 - AST_CAUSE_INTERWORKING 127
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