300 3xx Redirection RFC 3261
SIP 300 Multiple Choices
The address resolved to several possible locations, listed in Contact headers. The caller can choose one.
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Common causes
- A redirect server returns several possible contacts.
How to fix it
- Ensure your UA or proxy follows redirects, or configure the redirect server to return a single target.
Seeing 300 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 3xx responses
The caller should try a different location to complete the request.