[Serusers] can't connect to RPT proxy

[radan]

Hi all !
My ser.cfg (ser-0.8.12) is very similar like nathelper.cfg
I run rtpproxy as ./rtpproxy -l IPaddress.
On this same interface is ser binded
Communication between ser and rtpproxy is via /var/run/rtpproxy.sock

Why I'm not able to connect with rtpproxy ?
I have:

Dec  4 19:48:45 /usr/sbin/ser[19200]: ERROR: extract_mediaip: no 
`c=' in SDP
Dec  4 19:48:45 /usr/sbin/ser[19200]: ERROR: send_rtpp_command: can't connect to RTP proxy
Dec  4 19:48:45 /usr/sbin/ser[19200]: ERROR: extract_mediaip: no `c=' in SDP
Dec  4 19:48:45 /usr/sbin/ser[19200]: ERROR: send_rtpp_command: can't connect to RTP proxy
Dec  4 19:48:45 /usr/sbin/ser[19208]: WARNING: check_content_type: 
Content-TYPE header absent!let's assume the content is text/plain ;-)
Dec  4 19:48:45 /usr/sbin/ser[19208]: ERROR: on_reply processing failed

Regards
Andrzej