[Users] openser and rtpproxy on multihomed host

Hi! I'm experiencing problems using openser and rtpproxy on a multihomed box (IP addresses are 137.208.89.45 and 137.208.89.65). The client (firewalled) contacts the server via the first IP address (137.208.89.45) but rtpproxy sometimes uses it's second IP (137.208.89.65) in the "c=" SDP-information. (See below.) However it _sends_ RTP packets from the _first_ IP address. Those packets will never pass through the firewall, of course, since the clients outgoing RTP traffic is sent to another IP address than the incoming traffic is hitting the firewall from. Is there a way to tell rtpproxy to use the same IP-address both for the c= SDP header and as source address? -------------------- 8< -------------------- ## T 2007/06/05 15:57:36.041537 137.208.89.45:5060 -> 137.208.90.164:3099 [AP] SIP/2.0 183 Session Progress. Via: SIP/2.0/TCP 137.208.90.164:56136;branch=z9hG4bK-d87543-a107a77a6311422d-1--d87543-;rport=3099. From: "Alexander Bergolth"<sip:30001@wu-wien.ac.at>;tag=5b6d7b31. To: "996050"<sip:996050@wu-wien.ac.at>;tag=as2e40807f. Call-ID: MTVjYzlhMDdjMjAwODExZDEyNzk5M2IwN2UxNjhlYTc.. CSeq: 2 INVITE. User-Agent: Asterisk PBX. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY. Supported: replaces. Contact: <sip:996050@137.208.89.135>. Content-Type: application/sdp. Content-Length: 283. . v=0. o=root 6978 6978 IN IP4 137.208.89.135. s=session. c=IN IP4 137.208.89.65. t=0 0. m=audio 35064 RTP/AVP 0 8 101. a=rtpmap:0 PCMU/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16. a=silenceSupp:off - - - -. a=ptime:20. a=sendrecv. a=nortpproxy:yes. -------------------- 8< -------------------- -------------------- 8< -------------------- 15:57:35.814136 IP 137.208.90.164.3099 > 137.208.89.45.5060: P 4236850032:4236851080(1048) ack 224540451 win 64256 15:57:35.814147 IP 137.208.89.45.5060 > 137.208.90.164.3099: . ack 1048 win 2003 15:57:35.814351 IP 137.208.89.45.5060 > 137.208.90.164.3099: P 1:550(549) ack 1048 win 2003 15:57:35.814430 IP 137.208.89.45.5060 > 137.208.90.164.3099: P 550:1264(714) ack 1048 win 2003 15:57:35.814850 IP 137.208.90.164.3099 > 137.208.89.45.5060: . ack 1264 win 64177 15:57:35.915829 IP 137.208.90.164.3099 > 137.208.89.45.5060: P 1048:1418(370) ack 1264 win 64177 15:57:35.955948 IP 137.208.89.45.5060 > 137.208.90.164.3099: . ack 1418 win 2003 15:57:36.017309 IP 137.208.90.164.3099 > 137.208.89.45.5060: P 1418:2672(1254) ack 1264 win 64177 15:57:36.017320 IP 137.208.89.45.5060 > 137.208.90.164.3099: . ack 2672 win 2003 15:57:36.017397 IP 137.208.89.45.5060 > 137.208.90.164.3099: P 1264:1813(549) ack 2672 win 2003 15:57:36.018604 IP 137.208.89.45.5060 > 137.208.90.164.3099: P 1813:2388(575) ack 2672 win 2003 15:57:36.019170 IP 137.208.90.164.3099 > 137.208.89.45.5060: . ack 2388 win 64256 15:57:36.041454 IP 137.208.89.45.35064 > 137.208.90.164.10676: UDP, length 172 15:57:36.041537 IP 137.208.89.45.5060 > 137.208.90.164.3099: P 2388:3200(812) ack 2672 win 2003 15:57:36.046899 IP 137.208.90.164.10677 > 137.208.89.65.35065: UDP, length 132 15:57:36.061155 IP 137.208.89.45.35064 > 137.208.90.164.10676: UDP, length 172 15:57:36.080128 IP 137.208.90.164.10676 > 137.208.89.65.35064: UDP, length 172 15:57:36.081157 IP 137.208.89.45.35064 > 137.208.90.164.10676: UDP, length 172 [...] -------------------- 8< -------------------- Thanks in advance, --leo P.S.: I'm using openser-1.2 and rtpproxy-cvs20070222. -- e-mail ::: Alexander.Bergolth (at) wu-wien.ac.at fax ::: +43-1-31336-906050 location ::: Computer Center | Vienna University of Economics | Austria