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ISDN
0x00 "Valid cause code not yet received"
0x01 "Unassigned (unallocated) number"
0x02 "No route to specified transit network"
0x06 "Channel unacceptable"
0x10 "Normal call clearing"
0x11 "User busy"
0x12 "No user responding"
0x13 "No answer from user"
0x15 "Call rejected"
0x16 "Number changed"
0x1B "Destination out of order"
0x1C "Invalid number format (incomplete number)"
0x1D "Facility rejected"
0x1E "Response to STATUS ENQUIRY"
0x1F "Normal, unspecified"
0x21 "Circuit out of order"
0x22 "No circuit/channel available"
0x26 "Network out of order"
0x29 "Temporary failure"
0x2A "Switching equipment congestion"
0x2B "Access information discarded"
0x2C "Requested circuit/channel not available"
0x2D "Call preempted"
0x32 "Requested facility not subscribed (see Q.850)"
0x34 "Outgoing call barred"
0x36 "Incoming call barred"
0x3A "Bearer capability not presently available"
0x3F "Service or option not available, unspecified"
0x41 "Bearer capability not implemented"
0x42 "Channel type not implemented"
0x45 "Requested facility not implemented"
0x51 "Invalid call reference value"
0x52 "Identified channel does not exist"
0x58 "Incompatible destination"
0x5F "Invalid message, unspecified"
0x60 "Mandatory information element is missing"
0x61 "Message type non-existent or not implemented"
0x62 "Message not compatible with call state or message type non-existent or not implemented"
0x63 "Information element non-existent or not implemented"
0x64 "Invalid information element contents"
0x65 "Message not compatible with call state"
0x66 "Recovery on time expiry"
0x67 "Invalid length for information element"
0x6F "Protocol error, unspecified"
0x7F "Interworking, unspecified"
0x4F "Service or option not implemented, unspecified"
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SIP
200 "OK"
400 "BadRequest"
401 "Unauthorized"
402 "PaymentRequired"
403 "Forbidden"
404 "NotFound"
405 "MethodNotAllowed"
406 "NotAcceptable"
407 "ProxyAuthenticationRequired"
408 "RequestTimeout"
410 "Gone"
413 "RequestEntityTooLarge"
414 "RequestUriTooLong"
415 "UnsupportedMediaType"
416 "UnsupportedURIScheme"
420 "BadExtension"
421 "ExtensionRequired"
423 "IntervalTooBrief"
480 "TemporarilyUnavailable"
481 "CallTransactionDoesNotExist"
482 "LoopDetected"
483 "TooManyHops"
484 "AddressIncomplete"
485 "Ambiguous"
486 "BusyHere"
487 "RequestTerminated"
488 "NotAcceptableHere"
491 "RequestPending"
493 "Undecipherable"
500 "ServerInternalError"
501 "NotImplemented"
502 "BadGateway"
503 "ServiceUnavailable"
504 "ServerTimeout"
505 "VersionNotSupported"
513 "MessageTooLarge"
600 "BusyEverywhere"
603 "Decline"
604 "DoesNotExistAnywhere"
606 "NotAcceptable"
800 "BYE"
801 "CANCEL"