Hi,

I believe this has been discussed before but I can't find a definitive answer.
Using kamailio 4.2 with rtpengine.

My clients don't have natively any ICE relay candidates, just host and server reflexive from STUN.
What is the correct syntax to have rtpengine only add itself as relay candidate with lowest priority?

The current basic kamailio config I'm testing has rtpengine_manage empty of flags, which is almost working except that rtpengine's default behaviour in my circumstance is to add itself as a host candidate.

Reading through http://kamailio.org/docs/modules/devel/modules/rtpengine.html I believe what I want (ie. rtpengine adding itself as relay candidate only with lowest priority - not touching the rest of the SDP or any other ICE candidates sent by the clients) is not an option. Is my interpretaion correct or am I missing something glaringly obvious?

Thanks,
Peter


From the module's documentation:
    "The default (if no “ICE=...” is given at all), new ICE data will only be generated if no ICE was present in the SDP originally; otherwise the RTP proxy will only insert itself as additional ICE candidate."

Relevant kamailio config snippet:

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;

rtpengine_manage("");

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();
}
}
#!endif
return;
}