I have set up Linphone, the Internet SIP telephone software, and my brother, who is also using Linphone can call me but I can't call him.
If I run it from a terminal window there are no error messages but the call just times out. I can call a computer on the internal network without problems.
I, and my brother, are using ADSL and I have a 4-port ethernet router with a firewall enabled. The firewall is set to allow anything out and the appropriate ports (5060 & 7078) are open for incoming calls.
If I call my own internal address I get a popup window saying 'User is busy' but if I call my own external (Internet) address I get nothing and it eventually times out.
I have now run out of ideas (doesn't take much) and would very much appreciate any new suggestions.
Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain