[OpenSER-Users] OPTIONS problem

Hello , I have an working openser, i installed and configured in Nagios check_sip plugin, the problem is that openser answer to OPTIONS message with the error 500. Help me # U Y.Y.Y.Y:49813 -> X.X.X.X:5060 OPTIONS sip:820999@voip.md SIP/2.0 Via: SIP/2.0/UDP sheik:49813;rport From: sip:checksip@sheik:49813;tag=gd60cu To: sip:820999@voip.md Call-ID: dailgg@sheik CSeq: 1 OPTIONS Contact: sip:checksip@sheik:49813 Content-length: 0 Max-Forwards: 70 User-agent: check_sip 1.01 Accept: text/plain # U X.X.X.X:5060 -> Y.Y.Y.Y:49813 SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL). Via: SIP/2.0/UDP sheik:49813;rport=49813;received=Y.Y.Y.Y. From: sip:checksip@sheik:49813;tag=gd60cu To: sip:820999@voip.md;tag=420087ba42f57437a013c6a41fc4e4c8.b0df Call-ID: dailgg@sheik CSeq: 1 OPTIONS Server: OpenSer (1.1.1-notls (i386/linux)). Content-Length: 0. -- Best regards, Ion Minzu, Specialist Tehnologii Informationale, I.S."Centrul de Telecomunicatii Speciale", tel:250-540, 820922 (office), 069501208 (mob), 382869185 (ICQ) mailto:ion.minzu@cts.md