That's EXACTLY what i tried last weekend ! i installed Kphone/Pi and i tried FWD (and another one) SIP provider and i failed ! i guessed my trouble come from my Linksys router tied to my Thomson adsl modem...... although i opend and route the listed ports i could not have anything to work....could you help please ?
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you have to do some trickery, whereby you tell the router to port forward the RTP ports to the sip phone, as well as port forward the SIP port on 5600.
I think you also have to tell the sip phone the external IP address on the router.
I avoided all of this by putting my adsl modem router in bridge mode, so that the PC has the real IP address.
very very briefly...
you see, the problem is that a VOIP call takes place in two parts. There's the *s*ession *i*nitiation *p*rotocol which is where one phone request to make a call to another via the sip server, and says to the sip server where (i.e. IP address) it is. The remote phone then accepts.
the second part is where the RTP is a stream of audio data directly between the phones... if either sip phone is hiding behind a NAT gateway (e.g. a cable modem/router or adsl modem router which does connection sharing), RTP can't get through. The NAT gateway has to understand SIP to make it work. Or run a SIP proxy instead.
the classic resulting problem is that one phone can ring the other, but not the other way round, and/or you can only hear audio in one direction. use the echo test on FWD to test this out.
google for more info and help.
Paul
