I've had a Linksys (nee sipura) spa3102 for a while (worked fine in the UK with sipgate) but havent got round to configuring it for switzerland yet.
Idiots guide seeing as I had trouble finding this on the net:
1) factory reset: ****, 73738#, 1#, hangup
2) make sure you have a computer in the NAT socket ('Ethernet') - I use mine bridged or into a main switch
3) http://192.168.0.1 and reset Router > WAN Setup > Enable WAN Web Server > YES
4) Router > LAN Setup > Networking Service > BRIDGE
http://www.3amsystems.com/wireline/daa-search.htm?country=Switzerland helps a little
as does http://switzernet.com/public/070723-config_UA/spa-3102.php
Things I've changed are
Voice > Regional > TimeZone > "GMT +1"
Voice > Regional > FXS Port Impedance > "270+750||150nF"
Voice > Regional > Caller ID Method > ETSI FSK
Voice > Line 1 > Dialplan > (<#:>xx.<:@gw1>|xx.<:@gw0>)
This dialplan is because I wish to use swisscom pstn most of the time, but prefix with # if I want the call to go over the VOIP service
