513 5xx Server error RFC 3261
SIP 513 Message Too Large
The message was too long for the server to process.
Typical Q.850 / ISDN cause: 127 (Interworking, unspecified)
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Common causes
- Oversized INVITE because of large SDP or many headers, especially over UDP.
How to fix it
- Use TCP, or reduce SDP size and the number of codecs offered.
Seeing 513 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 5xx responses
The server failed to handle an apparently valid request.