Ciao Christian

PCAP file would be easier to read. But let's see..

1st Leg:

Linode Client1 IP: 93.189.137.22 => Kamailio Server: 44.3.44.40
(73 from HB9EUE :-) )

That Linode Client has RTP on: 192.168.1.21

2nd Leg:

Kamailio (44.3.44.40) => Client2 (88.116.10.134) Grandstream

RTP Side 1: 192.168.1.21

Grandstream => Kamaililio 200 OK + SDP

Grandstream tells: RTP on: 188.116.10.134

So, the question is: Can 188.116.10.134 <=> 192.168.1.21 communicate
with each other?

I fear not! 192.168.1.21 is obviously behind NAT.

93.189.137.22 probably is a NAT router. Maybe it has a SIP ALG setting
which would take care to open ports and rewrite the RTP IP address? If
not, you loose!

Kamailio does nothing with the RTP audio stream. So both connected
clients would need to be able to directly send UDP packets to each
other.

OR: You need to 'backhaul' the rtp audio stream via some RTP proxy like
rtpengine which could detect NAT and try to send the RTP stream back
to the IP it received it from, instead of the one advertised in the
SDP.

Mit freundlichen Grüssen

-Benoît Panizzon-
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