Polycom IP 320 Administrator's Manual page 347

2xx Responses - Success
Response
200 OK
202 Accepted
3xx Responses - Redirection
Response
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
305 Use Proxy
380 Alternative Service
4xx Responses - Request Failure
All 4xx responses for which the phone does not provide specific support will be
Note
treated the same as 400 Bad Request.
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
410 Gone
413 Request Entity Too Large
414 Request-URI Too Long
Supported Notes
Yes
Yes In REFER transfer.
Supported
Yes
Yes
Yes
No
No
Supported
Yes
Yes
No
No
Yes
Yes
No
Yes
No
No
No
No
Session Initiation Protocol (SIP)
Notes
Notes
B - 7