301 3xx Redirection RFC 3261
SIP 301 Moved Permanently
The user is no longer at the requested address. The caller should use the address in the Contact header from now on.
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Common causes
- A permanent number or address change.
How to fix it
- Update stored addresses or speed dials to the new Contact.
Seeing 301 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.