[SR-Users] (Kamailio/RTPproyx) Public -> LAN -> Asterisk (1, 2, .., n)

[Alexandr Usov]

I have Kamailio on OpenSUSE with static real Public IP (WAN), for ex.
1.1.1.1. I have LAN IP 2.2.2.2. Asterisk as KVM virtual machine with LAN IP
2.2.2.101 and default GW not the SuSe (2.2.2.2), but 2.2.2.1 pfsense LAN
with PUB IP 1.1.1.2) I am configured Registration of UA on Kamailio DB, and
on Asterisk side create a static peers with Kamailio LAN ip (host=2.2.2.2).

RTP Proxy question.

/usr/sbin/rtpproxy -u daemon -l 1.1.1.1 -s udp:127.0.0.1 12221

.... kamailio.cfg ...

# RTPProxy control
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;

        rtpproxy_manage();

    if (is_request()) {
        if (!has_totag()) {
            add_rr_param(";nat=yes");
        }
    }
    if (is_reply()) {
        if(isbflagset(FLB_NATB)) {
            fix_nated_contact();
        }
    }
#!endif
    return;
}


Testing call:

Whe User 1-100 calling User 1-101, on Asterisk side I see:

    -- Called SIP/1-100 at sip1.somedomain.com.ua
    -- SIP/sip1.somedomain.com.ua-000004cf is ringing
    -- SIP/sip1.somedomain.com.ua-000004cf answered SIP/1-101-000004ce
       > 0x15bc370 -- Probation passed - setting RTP source address to
1.1.1.1:50868
       > 0x7f2b6044bd10 -- Probation passed - setting RTP source address to
1.1.1.1:35082

Got  RTP packet from    1.1.1.1:50868 (type 00, seq 027109, ts 000160, len
000160)
Sent RTP packet to      1.1.1.1:35082 (type 00, seq 037469, ts 000160, len
000160)
Got  RTP packet from    1.1.1.1:50868 (type 00, seq 027110, ts 000320, len
000160)
Sent RTP packet to      1.1.1.1:35082 (type 00, seq 037470, ts 000320, len
000160)
Got  RTP packet from    1.1.1.1:50868 (type 00, seq 027111, ts 000480, len
000160)
Sent RTP packet to      1.1.1.1:35082 (type 00, seq 037471, ts 000480, len
000160)
Got  RTP packet from    1.1.1.1:50868 (type 00, seq 027112, ts 000640, len
000160)
Sent RTP packet to      1.1.1.1:35082 (type 00, seq 037472, ts 000640, len
000160)


Voice transfers OK.

But why not Kamailio LAN ip I receiving on the Asterisk side with the same
LAN?

And Kamailio log grep:

skynet:~ # tail -f /var/log/messages | grep rtpproxy
2013-08-05T19:18:17.508760+03:00 skynet kamailio[25462]: 3(25481) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:17.508875+03:00 skynet kamailio[25462]: 3(25481) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 63566 1.1.1.1
2013-08-05T19:18:17.530765+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:17.530876+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 41958 1.1.1.1
2013-08-05T19:18:18.625815+03:00 skynet kamailio[25462]: 4(25482) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:18.627131+03:00 skynet kamailio[25462]: 4(25482) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 39876 1.1.1.1
2013-08-05T19:18:18.632649+03:00 skynet kamailio[25462]: a=nortpproxy:yes
2013-08-05T19:18:18.648075+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:18.649615+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 43500 1.1.1.1
2013-08-05T19:18:18.653948+03:00 skynet kamailio[25462]: a=nortpproxy:yes
2013-08-05T19:18:18.688603+03:00 skynet kamailio[25462]: 4(25482) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:18.689762+03:00 skynet kamailio[25462]: 4(25482) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 63566 1.1.1.1
2013-08-05T19:18:18.701062+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy_funcs.c:148]: check_content_type(): type
<application/sdp> found valid
2013-08-05T19:18:18.701405+03:00 skynet kamailio[25462]: 6(25484) DEBUG:
rtpproxy [rtpproxy.c:2624]: force_rtp_proxy(): proxy reply: 43500 1.1.1.1
2013-08-05T19:18:18.705506+03:00 skynet kamailio[25462]: a=nortpproxy:yes

My goal is using Asterisk boxes behind Kamailio with the same LAN or even
OpeVPN Lan2Lan, with Public IP on Kamailio WAN for users registration and
RTP routing. So is strange to my, why RTPproxy not rewrite source of RTP
traffic from PUBLIC Kamailio IP to LAN Kamailio IP when user A calls B via
Asterisk?
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