Re: [Ekiga-list] No incoming traffic problem



On 10/31/2010 06:41 AM, Aramil wrote:

I am using a NanoStation 2 in Router mode.The NS is connected wirelessly to my neighbor's router and a switch is connect via ethernet to the NS for LAN use.

The past few days I'm trying to use a VoIP client software to connect to my VoIP account.I use Ekiga Softphone to do so, which requires UDP ports 3478-3479 and 5000-5100 to be open.

So I have opened these ports both on my neighbor's router and on the NS.The problem that I'm encountering is that although I manage to register to the VoIP service, when I answer an incoming call the caller is able to hear me, but I'm not able to hear the caller.So I used wireshark and figured that there is no incoming traffic on my end.

I have used many linux VoIP clients with PCs connecting straight forward to an ADSL router and worked perfectly.So this has something to do with NS...

You also need incoming RTP ports open. 
SIP 5000 to 5100 UDP SIP signalling, listen port: 5060
STUN 3478 to 3479 UDP Outgoing traffic to the STUN server
RTP Random/Various UDP Incoming traffic from the other end. Often 5004, 7070, 16382

Somehow the incoming RTP ports happen automagically in most case, I'd like to understand how. 
Treating it as magic for the moment, I've noticed that turning on ip_nat_sip on linux iptables has the effect of
blocking *outgoing* audio.  Ekiga seems to work best with no fancy help from the router.  Is there some kind of
"stateful SIP" option that can be turned off?


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