| 300 |
Incompatible network protocol: One or more network protocols contained in the session description are not available. |
| 301 |
Incompatible network address formats: One or more network address formats contained in the session description are not available. |
| 302 |
Incompatible transport protocol: One or more transport protocols described in the session description are not available. |
| 303 |
Incompatible bandwidth units: One or more bandwidth measurement units contained in the session description were not understood. |
| 304 |
Media type not available: One or more media types contained in the session description are not available. |
| 305 |
Incompatible media format: One or more media formats contained in the session description are not available. |
| 306 |
Attribute not understood: One or more of the media attributes in the session description are not supported. |
| 307 |
Session description parameter not understood: A parameter other than those listed above was not understood. |
| 330 |
Multicast not available: The site where the user is located does not support multicast. |
| 331 |
Unicast not available: The site where the user is located does not support unicast communication (usually due to the presence of a firewall). |
| 370 |
Insufficient bandwidth: The bandwidth specified in the session description or defined by the media exceeds that known to be available. |
| 399 |
Miscellaneous warning: The warning text can include arbitrary information to be presented to a human user or logged. A system receiving this warning MUST NOT take any automated action. |
