![]() ![]() We checked RFC3261 to find “CSeq” in SIP-REGISTER procedures: A UA MUST increment the CSeq value by one for each REGISTER request with the same Call-ID. We checked the REGISTER messages, and think it is no problem in CSeq header. We captured the log and found the voip provider returned “400 Bad Request” message with following cause: P-Registrar-Error: Invalid CSeq number That’s very strange because “external line” is a very basic function of MSS and it works perfectly with lots of voip providers. One of our customers reported a problem that his external line was always offline with a voip provider. ![]()
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