[Serusers] Swyx LinkMgr or SER problem ?

Hi List, I use SER-0.8.14 and nathelper/rtpproxy and everyting works fine with severel sip phones, expect Swyx LinkMgr. SER cannot extract media ip from it's INVITE and force_rtp_proxy doesn't work. Here is SDP body: Content-Type: application/sdp. User-Agent: Swyx LinkMgr/5.01pl7. Content-Length: 272. . v=0. o=- 1144063156 1144063156 IN IP4 192.168.0.22. s=Swyx LinkMgr. c=IN IP4 192.168.0.22. t=0 0. m=audio 55036 RTP/AVP 0 8 18 101. a=fmtp:18 annexb=no. a=fmtp:101 0-15. a=rtpmap:0 PCMU/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:18 G729/8000. a=rtpmap:101 telephone-event/8000. SER debug: 0(25228) DEBUG:check_content_type: type <application/sdp> found valid 0(25228) DEBUG: add_param: tag=6f55235b 0(25228) end of header reached, state=29 0(25228) ERROR: extract_mediaip: no `c=' in SDP 0(25228) parse_headers: flags=-1 What's wrong with this ? I have no ideal :-( Regards, imedve