This is a list of the known SIP status codes
100 – Trying
180 – Ringing
181 – Call Being Forwarded
182 – Call Queued
183 – Session Progress
200 – OK
202 – Accepted
300 – Multiple Choices
301 – Moved Permanently
302 – Moved Temporarily
305 – Use Proxy
380 – Alternative Service
400 – Bad Request
401 – Unauthorized
402 – Payment Required
403 – Forbidden
404 – Not Found
405 – Method Not Allowed
406 – Not Acceptable
407 – Proxy Authentication Required
408 – Request Timeout
409 – Conflict
410 – Gone
411 – Length Required
413 – Request Entity Too Large
414 – Request URI Too Long
415 – Unsupported Media Type
416 – Unsupported URI Scheme
420 – Bad Extension
421 – Extension Required
423 – Interval Too Brief
480 – Temporarily Unavailable
481 – Call/Transaction Does Not Exist
482 – Loop Detected
483 – Too Many Hops
484 – Address Incomplete
485 – Ambiguous
486 – Busy Here
487 – Request Terminated
488 – Not Acceptable Here
491 – Request Pending
493 – Undecipherable
500 – Server Internal Error
501 – Not Implemented
502 – Bad Gateway
503 – Service Unavailable
504 – Server Time-Out
505 – Version Not Supported
513 – Message Too Large
600 – Busy Everywhere
603 – Declined
604 – Does Not Exist Anywhere
605 – Not Acceptable
