Yealink SIP-T54S Administrator's Manual page 1086

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
4xx Response
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
5xx Responses—Server Failure
5xx Response
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
6xx Response—Global Failures
6xx Response
600 Busy Everywhere
1060
Supported
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
Supported
Yes
Yes
No
Yes
No
No
No
Supported
Yes
Notes
Notes
Notes