Failover Based on Telephony Cause Codes
November 2009 237
482 Loop detected 25
484 Address incomplete 28
485 Ambiguous 1
486 Busy here 17
487 Request Cancelled 21
488 Not acceptable here 31
500 Internal server error 41
501 Not implemented 79
502 Bad gateway 38
503 Service unavailable 41
504 Server time-out 102
505 Version not supported 127
513 Message Too Large 127
600 Busy everywhere 17
603 Decline 21
604 Does not exist anywhere 1
606 Not acceptable 31
SIP Cause
Code Description Q.931 Cause Code