asterisk E1线路挂断电话的原因

http://www.voip-info.org/wiki/view/Asterisk+variable+hangupcause

/* Causes for disconnection (from Q.931) */

1. define AST_CAUSE_UNALLOCATED 1
2. define AST_CAUSE_NO_ROUTE_TRANSIT_NET 2
3. define AST_CAUSE_NO_ROUTE_DESTINATION 3
4. define AST_CAUSE_CHANNEL_UNACCEPTABLE 6
5. define AST_CAUSE_CALL_AWARDED_DELIVERED 7
6. define AST_CAUSE_NORMAL_CLEARING 16
7. define AST_CAUSE_USER_BUSY 17
8. define AST_CAUSE_NO_USER_RESPONSE 18
9. define AST_CAUSE_NO_ANSWER 19
10. define AST_CAUSE_CALL_REJECTED 21
11. define AST_CAUSE_NUMBER_CHANGED 22
12. define AST_CAUSE_DESTINATION_OUT_OF_ORDER 27
13. define AST_CAUSE_INVALID_NUMBER_FORMAT 28
14. define AST_CAUSE_FACILITY_REJECTED 29
15. define AST_CAUSE_RESPONSE_TO_STATUS_ENQUIRY 30
16. define AST_CAUSE_NORMAL_UNSPECIFIED 31
17. define AST_CAUSE_NORMAL_CIRCUIT_CONGESTION 34
18. define AST_CAUSE_NETWORK_OUT_OF_ORDER 38
19. define AST_CAUSE_NORMAL_TEMPORARY_FAILURE 41
20. define AST_CAUSE_SWITCH_CONGESTION 42
21. define AST_CAUSE_ACCESS_INFO_DISCARDED 43
22. define AST_CAUSE_REQUESTED_CHAN_UNAVAIL 44
23. define AST_CAUSE_PRE_EMPTED 45
24. define AST_CAUSE_FACILITY_NOT_SUBSCRIBED 50
25. define AST_CAUSE_OUTGOING_CALL_BARRED 52
26. define AST_CAUSE_INCOMING_CALL_BARRED 54
27. define AST_CAUSE_BEARERCAPABILITY_NOTAUTH 57
28. define AST_CAUSE_BEARERCAPABILITY_NOTAVAIL 58
29. define AST_CAUSE_BEARERCAPABILITY_NOTIMPL 65
30. define AST_CAUSE_CHAN_NOT_IMPLEMENTED 66
31. define AST_CAUSE_FACILITY_NOT_IMPLEMENTED 69
32. define AST_CAUSE_INVALID_CALL_REFERENCE 81
33. define AST_CAUSE_INCOMPATIBLE_DESTINATION 88
34. define AST_CAUSE_INVALID_MSG_UNSPECIFIED 95
35. define AST_CAUSE_MANDATORY_IE_MISSING 96
36. define AST_CAUSE_MESSAGE_TYPE_NONEXIST 97
37. define AST_CAUSE_WRONG_MESSAGE 98
38. define AST_CAUSE_IE_NONEXIST 99
39. define AST_CAUSE_INVALID_IE_CONTENTS 100
40. define AST_CAUSE_WRONG_CALL_STATE 101
41. define AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE 102
42. define AST_CAUSE_MANDATORY_IE_LENGTH_ERROR 103
43. define AST_CAUSE_PROTOCOL_ERROR 111
44. define AST_CAUSE_INTERWORKING 127

1. define AST_CAUSE_BUSY AST_CAUSE_USER_BUSY
2. define AST_CAUSE_FAILURE AST_CAUSE_NETWORK_OUT_OF_ORDER
3. define AST_CAUSE_NORMAL AST_CAUSE_NORMAL_CLEARING
4. define AST_CAUSE_NOANSWER AST_CAUSE_NO_ANSWER
5. define AST_CAUSE_CONGESTION AST_CAUSE_NORMAL_CIRCUIT_CONGESTION
6. define AST_CAUSE_NOTDEFINED 0

[Jan 13 14:49:25] VERBOSE[13266] logger.c: < Protocol Discriminator: Q.931 (8)  len=13
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < Call Ref: len= 2 (reference 337/0x151) (Terminator)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < Message type: DISCONNECT (69)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < [08 02 82 a6]
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  Spare: 0  Location: Public network serving the local user (2)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: <                  Ext: 1  Cause: Network out of order (38), class = Network Congestion (resource unavailable) (2) ]
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < [1e 02 82 88]
[Jan 13 14:49:25] VERBOSE[13266] logger.c: < Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  0: 0  Location: Public network serving the local user (2)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: <                               Ext: 1  Progress Description: Inband information or appropriate pattern now available. (8) ]
[Jan 13 14:49:25] VERBOSE[13266] logger.c: -- Processing IE 8 (cs0, Cause)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: -- Processing IE 30 (cs0, Progress Indicator)
[Jan 13 14:49:25] VERBOSE[13266] logger.c: q931.c:3826 q931_receive: call 33105 on channel 4 enters state 12 (Disconnect Indication)

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