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Error Codes
You may see the following error codes:
401 Not authorised
404 User not found
486 Busy Here
487 General fault
500 Server fault
503 Service not reachable
Other *less frequent (error codes):
100 Trying...
180 Ringing...
181 Call forwarded
182 In waiting queue
183 Session progress response
200 OK
300 Several possibilities
301 Permanently forwarded
302 Temporarily forwarded
380 Different service
400 Wrong number
401 Not authorised
402 Payment necessary
403 Not permitted
404 User not found
405 Method not allowed
406 Not acceptable
407 Proxy authentication necessary
408 No answer
409 Conflict
410 No longer reachable
411 Length necessary
413 Message too long
414 URI too long
415 Media type not supported
416 Not supported URI scheme
420 Wrong ending
421 Extension required
422 Session timer interval too short
423 Reregister interval too brief (interval too short)
480 Not reachable at this time
481 User doesn't exist
482 Loop detected
483 Too many hops
484 Wrong address
485 Ambigous
486 Busy here
487 General fault
488 Not acceptable here
489 Bad event
500 Server fault
501 Not implemented
502 Wrong gateway
503 Service not reachable
504 Exceeding time with gateway
505 SIP version is not supported
513 Message too long
600 Busy
603 Given
604 Doesn't exist
605 Not acceptable
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