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