430 4xx Client error RFC 5626
SIP 430 Flow Failed
A specific outbound flow (SIP Outbound) to the user agent failed. Seen between edge proxies and registrars.
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Common causes
- The connection between edge proxy and UA closed.
How to fix it
- The UA should re-register to create a new flow. Check keep-alives.
Seeing 430 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.