Onesuite has a VOIP. What about something like a free did and pbxes.com?

I am using several did's and pbxes. See this thread http://www.prepaidgsm.net/forum/showthread.php?t=2064

It works fine but for a novice a bit complicated. I am although using it as my total phone communication system. Customers call me on my DID numbers from several countries. My normal voip phone rings and parallel after 2-3 rings my IOM mobile also rings. So whenever in the office I pickup using my normal phone and when away my mobile.

Andy gave an example of an other solution. Forward your betamax account (voipbuster, sipdiscount, internetcall etc) to your IOM number. Have a did number forward to the betamax number. It's simple and it works.

For United Mobile Lichtenstein numbers Betamax is not very good. I have not been able to call my UM number using betamax.