I signed up for VOIPo this week and they are shipping me the adapter. In the meantime I wanted to test the service with the SIP setting that was mailed to me. Xlite was working good but my PAP2T was not working. I was getting the "Can't login to the server" error on Line2 which was configured for VOIPo

After looking at the debug log [which had the GetServerAddrErr (sip.voipwelcome.com,1)=-101 error] I found out that I had to disable the "Use DNS SRV" field to get it to working. After I set the field to "No", I got the dial tone. And I am able to make outgoing calls.

The major difference that I saw from previous provider was the phone rang immediately after I dialed the number.