Well, a call trace would help... You use no rtp proxy, so a symmetric NAT will not work for incoming calls. (if you have a GW with active media support, your outgoing calls will be ok) g-) ----- Original Message ----- From: Rick Thompson To: serusers(a)lists.iptel.org Sent: Thursday, September 01, 2005 10:56 PM Subject: [Serusers] NAT Router problem Has anyone come across this problem before?? I have the same configuration for each of the following except the first session is going thru a Linksys router and the second one goes thru a Dlink router. The first session works fine, the second session has one way audio. The only difference in the traces is in the following lines. Session one Via: SIP/2.0/UDP 192.168.1.108:5060;rport=5060;received=199.227.155.139;branch=z9hG4bK-389cba09 Session two Via: SIP/2.0/UDP 192.168.1.40:5060;rport=61034;received=199.227.155.135;branch=z9hG4bK-349cafaf I have the following in ser.cfg to correct for a NATed UAC if(nat_uac_test("3")) { xlog("L_ALERT", "%Tf %mf ****** NATed UAC detected.\n"); fix_nated_contact(); force_rport(); if(method == "INVITE") { fix_nated_sdp("3"); }; }; And onreply_route[1] { xlog("L_ALERT", "%Tf %mf ****** On Reply From: <%si> <%tu> <%fu> <%rm> <%rs> <%rr>\n"); if(status=~"(183)|(2[0-9][0-9])" && nat_uac_test("3")) { xlog("L_ALERT", "%Tf %mf ****** Fixing contact on reply\n"); fix_nated_contact(); force_rport(); fix_nated_sdp("3"); }; Can anyone help Thanks for your reply Rick Thompson, CCNA VP of Technology Virtual Communications, LLC O 954-334-4000 ext 420 M 954-217-7322 F 954-252-4580 ------------------------------------------------------------------------------ _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers