SIP 300 Multiple Choices vs 413 Request Entity Too Large
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 413 (Request Entity Too Large) is a 4xx Client Failure response. 300 indicates that the address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint. In contrast, 413 means that the server is refusing to process the request because the message body is larger than the server is willing to accept.
Description
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
When You See It
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
How to Fix
Select one of the provided Contact addresses and resend the request to that specific URI.
Description
The server is refusing to process the request because the message body is larger than the server is willing to accept.
When You See It
When sending a SIP message with a body (SDP, XML, etc.) that exceeds the server's size limit.
How to Fix
Reduce the size of the message body. For SDP, minimize codec offers or remove unnecessary attributes.
Key Differences
300 is a 3xx Redirection response, while 413 is a 4xx Client Failure response.
SIP 300: The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
SIP 413: The server is refusing to process the request because the message body is larger than the server is willing to accept.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
You encounter 413 when when sending a SIP message with a body (SDP, XML, etc.) that exceeds the server's size limit.
When to Use Which
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 413 (Request Entity Too Large): Reduce the size of the message body. For SDP, minimize codec offers or remove unnecessary attributes.