Ok...I had a brainwave. I setup the SIPme account on phone port 2 of the 7402. It registered and I tried calling the echo test *393613 which worked OK.
What I can say works after that test...
1. Both FXS ports use the same UDP ports so it can't be a NAT issue.
2. Both Voxalot and SIPme are both registered in the Status page.
3. The phone I am using works
....Under VOIP wizard the settings are
SIP Service Provider voxalot.com
Phone Number 959xxx
Authentication Username 959xxx
Authentication Password ********
......Under General Settings
Registrar Address(or Hostname) voxalot.com
Registrar Port 5060
Expire 3600
User Domain/Realm voxalot.com
Outbound Proxy Address voxalot.com
Outbound Proxy Port 5060
Do those settings look right?