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If in Skype I've set Use port 15295 for incoming connections in the Options>Advanced menu.

1) Firstly, do I need to open forward this port on my home router? 2) Secondly, do I need to have an iptables rule to accept incoming connections on this port? e.g.

iptables -A INPUT -p UDP --dport 15294 -j ACCEPT
iptables -A INPUT -p tcp --dport 15294 -j ACCEPT

Or will the conntrack take care of things if I have rules

iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

I should explain that Skype seems to work OK (I can video call) with just the conntrack (i.e. without forwarding 15294 on the router or allowing it in iptables) but I am trying to speed things up, and I am wondering if I am not getting a direct connection....

During a call if I do lsof -i -n -P I get

skype     3457    21u  IPv4  29503      0t0  UDP 
skype     3457    33w  IPv4  78971      0t0  TCP> (ESTABLISHED
skype     3457    40u  IPv4  32813      0t0  TCP> (ESTABLISHED)
skype     3457    42r  IPv4  73175      0t0  TCP> (ESTABLISHED)
skype     3457    50u  IPv4  76343      0t0  TCP> (ESTABLISHED)
skype     3457    63u  IPv4  30239      0t0  TCP> (ESTABLISHED)
skype     3457    64u  IPv4  73177      0t0  TCP> (ESTABLISHED)
skype     3457     67u  IPv4  73219      0t0  TCP> (ESTABLISHED)
skype     3457     68u  IPv4  31855      0t0  TCP *:15295 (LISTEN)
skype     3457     69u  IPv4  31856      0t0  UDP *:15295 
skype     3457     71u  IPv4  60715      0t0  TCP>"my friend's IP":52416 (ESTABLISHED)

Clearly Skype is listening on 15295 but I don't see any connections on it? My friend and I are connected as>"my friend's IP":52416 after I receive the call. Why not on 15295? is the local Proxy privoxy that all http/https is set to go through.

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