417 4xx Client error RFC 4412
SIP 417 Unknown Resource-Priority
The request had a Resource-Priority header that the server does not understand.
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Common causes
- Priority namespaces used for emergency or government networks.
How to fix it
- Remove the Resource-Priority header, or align namespaces with the peer.
Seeing 417 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 4xx responses
The request has a problem or cannot be completed at this server, usually because of something on the requesting side or the target user.