Hello everybody,
we have got a problem with sdp-nat on retries of a 200 OK packet. Due to
slow response of our trunk the 200 ok is resend (up to 3 times) but sdp-nat
is only done on the first two packets. We are running Kamailio 4.1.0 with
the following setup:
Trunk --> NAT --> Kamailio --> Voip Bridge
The rtp stream from the trunk (public ip) is supposed to go to one of our
media gateways (behind 1:1 nat). We use sdp_mangle_ip to replace the private
IPs of our Mediagateway with the public ones. This goes well with the first
200 OK packet but not with a retry.
A.A.A.A (public trunk media IP)
B.B.B.B (our public media IP - 1:1 natted to I.I.I.I)
INVITE Trunk --> Kamailio
Connection Information (c): IN IP4 A.A.A.A
INVITE Kamailio --> Voip Bridge
Connection Information (c): IN IP4 A.A.A.A
200 OK Kamailio <-- Voip Bridge
Connection Information (c): IN IP4 I.I.I.I
200 OK Trunk <-- Kamailio
Connection Information (c): IN IP4 B.B.B.B
200 OK Kamailio <-- Voip Bridge
Connection Information (c): IN IP4 I.I.I.I
200 OK Trunk <-- Kamailio
Connection Information (c): IN IP4 I.I.I.I
ACK Trunk --> Kamailio --> Voip Bridge
Our configuration used is the following:
route[RELAY] {
xlog("L_INFO"," In route Block RELAY \n");
# enable additional event routes for forwarded requests
if (is_method("INVITE|SUBSCRIBE|UPDATE")) {
if(!t_is_set("onreply_route")) t_on_reply("MANAGE_REPLY");
}
if (!t_relay()) {
xlog("L_NOTICE", " (ROUTE_RELAY) Relay failed, sending error
\n");
sl_reply_error();
}
exit;
}
onreply_route[MANAGE_REPLY] {
xlog("L_INFO"," In route Block MANAGE_REPLY \n");
if ( isflagset(20) ) { -- we have to do nat
route(SDP_NAT);
force_send_socket(KAMAILIO_TO_TRUNK_IP);
} else {
force_send_socket(KAMAILIO_TO_BRIDGE_IP);
}
}
How can we handle the 200 OK retry? Is there a way to do this?
Kind regards
Timo Klecker
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