Dear Community,
I have a problem with rtpproxy not changing the SDP IP in connection information in following scenario:
SIP1 -> kamailio1 + rtpproxy1 -> kamailio2 + rtpproxy2 -> SIP2
The first kamailio put SDP IP correctly (from rtpproxy) then the second kamailio does not change SDP connection information.
I think its related to SDP body which has:
a=nortpproxy:yes
line added by kamailio1.
So i tried to remove the a=nortpproxy:yes line from SDP before calling rtpproxy_manage. But it looks like no difference in working - i think the SDP sent to rtpproxy is still having the line even when i removed it.
The issue is not happening when i remove kamailio1 + rtpproxy1. In that case my IP is put correctly in SDP in INVITE and in 200 OK.
In case of two kamailio with rtpproxy (kamailio1 and kamailio2) in signalling path i am getting:
rtpproxy [rtpproxy.c:2586]: force_rtp_proxy(): incorrect port 0 in reply from rtp proxy
for replies (SIP2 IP address in 200OK SDP is present instead of kamailio2 IP address). For request INVITE i am not getting the error but the IP in SDP doesn't change.
kamailio2 config is now like below (but the attempt to remove a=nortpproxy:yes, did not work for me)
# RTPProxy control and signaling updates for NAT traversal route[NATMANAGE] { #!ifdef WITH_NAT if (is_request()) { if(has_totag()) { if(check_route_param("nat=yes")) { setbflag(FLB_NATB); } } } # if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB))) return; -- commented this out because sometimes rtpproxy was not used and i wanted to use it always
# added below code to remove a=nortpproxy:yes from SDP before rtpproxy_manage but its still not working
if( has_body("application/sdp") && (1 == sdp_get_line_startswith("$avp(nortpproxy)", "a=nortpproxy" )) ){ sdp_remove_line_by_prefix("a=nortpproxy:yes"); xlog("removed nortpproxy:yes from SDP"); }
if(nat_uac_test("8")) { xlog("rtpproxy CO"); rtpproxy_manage("co","MY_PUBLIC_IP_HERE"); } else { xlog("rtpproxy COR"); rtpproxy_manage("cor"," MY_PUBLIC_IP_HERE "); }
if (is_request()) { if (!has_totag()) { if(t_is_branch_route()) { add_rr_param(";nat=yes"); } } } if (is_reply()) { if(isbflagset(FLB_NATB)) { if(is_first_hop()) set_contact_alias(); } }
if(isbflagset(FLB_NATB)) { # no connect message in a dialog involving NAT traversal if (is_request()) { if(has_totag()) { set_forward_no_connect(); } } } #!endif return; }
Best regards, Tom
PS. thanks for any hints to resolve the issue.