199 1xx Provisional RFC 6228
SIP 199 Early Dialog Terminated
A proxy tells the caller that one forked early dialog has ended, before the final response arrives.
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Common causes
- Parallel forking where one branch fails while others continue.
How to fix it
- Informational. Supported only by newer stacks, so you can usually ignore it.
Seeing 199 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 1xx responses
The request was received and is being processed. The call is not finished yet.