Yealink T46G Administrator's Manual page 391

4xx Response
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
5xx Response—Server Failure Responses
5xx Response
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 Version Not Supported
6xx Response—Global Responses
6xx Response
600 Busy Everywhere
603 Decline
604 Does Not Exist Anywhere
606 Not Acceptable
Supported
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
Supported
Yes
Yes
No
No
No
No
Supported
Yes
Yes
No
No
Appendix
Notes
Notes
Notes
377