16 Jan
2020
16 Jan
'20
4:23 p.m.
On 15/01/2020 13.39, Nuno Miguel Reis wrote:
Hi guys.
I'm replacing a environment where I was using kamailio + freeswitch by
another where I'm adding rtpengine to the mix.
One of the issues I'm having now is when I have a SIP Client behind NAT:
When I send the INVITE from the SIP Client, the SDP is using the
private LAN IP address + the advertised media port, let's admit it's
10.10.10.10:5000 <http://10.10.10.10:5000> when the call establishes
with a public server running kamailio + rtpengine, the actual RTP
arrives from the home router public IP on a natted port, let's admit
it's 100.100.100.100:65100 <http://100.100.100.100:65100>, event
though, RTPENGINE assumes that RTP stream is coming from
100.100.100.100 <http://100.100.100.100>:5000.I'm using the
'--sip-source' with RTPENGINE to make it use the received ip address
instead of the private IP coming in the SDP but I'm not finding
anything to make RTPENGINE adapt an start sending the RTP FLOW to the
port where he starts receiving the RTP flow from, discarding the SDP
media port information.
Rtpengine does this automatically, unless the `asymmetric` flag is used.
You should see a log message about a `confirmed peer address` as soon as
the first RTP is received on a port.
Cheers