Hello,
We have a transparent proxy in front of Asterisk boxes. The media is handled by
rtpengine, and the "manage" work is done by Kamailio in the route[NATMANAGE]
section like this:
if(nat_uac_test("8")) {
# Packet from backend server
if(ds_is_from_list()){
if (rtpengine_manage("replace-origin
replace-session-connection direction=internal direction=pub")) {
xdbg("NATMANAGE --- Success rtpengine_manage() RTP from
INTERNAL to EXTERNAL $ru");
}
}
else
{
if (rtpengine_manage("replace-origin
replace-session-connection direction=pub direction=internal")) {
xdbg("NATMANAGE --- Success rtpengine_manage() RTP from
EXTERNAL to INTERNAL $ru");
}
}
} else {
# Packet from backend server
if(ds_is_from_list()){
if (rtpengine_manage("replace-origin
replace-session-connection trust-address direction=internal direction=pub")) {
xdbg("NATMANAGE --- Success rtpengine_manage() RTP from
INTERNAL to EXTERNAL $ru");
}
}
else
{
if (rtpengine_manage("replace-origin
replace-session-connection trust-address direction=pub direction=internal")) {
xdbg("NATMANAGE --- Success rtpengine_manage() RTP from
EXTERNAL to INTERNAL $ru");
}
}
}
Everything is working fine, but with some clients (like Grandstream phone) the
RTCP session wants to go tot he private address of the phone. Here is the log
of one of these strange calls:
Apr 27 16:54:38 rtp1 rtpengine[2273]: INFO:
[312ed76c31f21b71452e91e5184ad25b@172.16.2.210:5060]: [core] --------- Port
178.238.213.14:11088 <> 81.183.216.3:5068 , SSRC 77c19488, 625 p, 107500 b,
0 e, 29 ts
Apr 27 16:54:38 rtp1 rtpengine[2273]: INFO:
[312ed76c31f21b71452e91e5184ad25b@172.16.2.210:5060]: [core] --------- Port
178.238.213.14:11089 <> 10.0.5.192:5069 (RTCP), SSRC 0, 0 p, 0 b, 0 e, 43
ts
As you can see the RTP itself is okay, but the RTCP will somehow go to the
private address. If we tracing the sdp messages in sngrep, then we can see that
Kamailio transforming IP addresses for the backend servers to the public (and
the private address of the rtpengine) addresses.
We are missing something?
Thank you!
With kind regards,
Zoltan
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