SIPB-789 — SIP line misformed
The SIP proxy tried to parse a control message line. However, the line format is incorrect. The detail error description can be found in previous log messages.
The SIP message line is rejected. If the line is necessary, the request will be rejected, too. Otherwise, the message is passed without the line.
This error is mostly caused by incorrect software on the peer. However, if the line seems reasonably to you, please, report the error to the authors.