Yealink SIP-T2 Series Administrator's Manual page 497

1xx Response
181 Call Is Being Forwarded
183 Session Progress
2xx Response—Successful Responses
2xx Response
200 OK
202 Accepted
3xx Response—Redirection Responses
3xx Response
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
4xx Response—Request Failure Responses
4xx Response
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
Supported
Yes
Yes
Supported
Yes
Yes In REFER transfer.
Supported
Yes
Yes
Yes
Supported
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
No
Appendix
Notes
Notes
Notes
Notes
485