I follow the "official guide" and have no problem.Maybe someone can explain it better.Don't forget to put the prefix
http://countrycode.org/1. You have to set up the new VoIP accont
In order to make call, you have to set up VOIP account.
1. Go to Receive coin Tab, right click the address you wish to use and click set up as VOIP account.
2. Go to VoirCalls tab and click connect. Now you can call any viorcoin address
2. You have to register for gateway subscription
Go to Viorcalls tab in the wallet, select Gateway and input your phone number.
3. After completing the gateway subscription, deposit viorcoin into the VIOR address shown in the viorcoin gateway subscription window and start making international and long distance call without registering your name and email address.