I guess, but it is pretty Simple
1. Find a Number Local to the person that wants to call you
SIPBroker - PSTN Numbers
2. He should enter your Number/Extension when prompted in the format *010xxxxxx (where xxxxxx is your VoXalot Number)
THAT'S ALL!!!
Note: For ease of use every VoXalot user (regardless of server cluster) can be reached with *010 or any other of the two SipCodes assigned to VoXalot