How it works

From VoIP.ms Wiki

HOW voip.ms WORKS

Voip.ms is a voice over Internet protocol provider, our service requires an Internet Service Provider(ISP) and works through SIP/IAX2 protocols, if you wish to update your regular telephone service to a new improved system of voice over IP you will need to get en Internet connection, an ATA Adapter and a regular analogue handset.

Voip.ms is a prepaid service that allows you to control your expenses, you can add funds with a minimum amount of $25 USD via Credit Card, PAyPal, Bank Wire or Western Union(depending on the account restrictions). Your payments will be added to your balance and your calls and other charges will be debited from that balance, every time you run low on balance you could repeat this process again.

With us the incoming and outgoing calls are charged and handled separately, the incoming calls are charged depending on the plan of the DID 
and the outgoing calls will be charged always per minute depending on the termination of the calls:

Incoming calls

The incoming calls are charged depending on the plan of the DID, for example:

                  Per Minute Plan:                          Monthly Flat Rate Plan:      
                  ----------------                          -----------------------
- New York DID    $0.99 per Month / $0.01 per minute        $4.95 per Month / $0.00 per minute     
- Winnipeg DID    $1.99 per month / $0.0149 per minute      $5.95 per month / $0.00 per minute

DID(xxx.xxx.xxxx) <-------------------- Incoming calls

Outgoing calls

The outgoing calls will be charged depending on the termination of the call, for local calls:

                   Value route:                     Premium route
                   ------------                     -------------
United states:     $0.0105 per minute               $0.0125 per minute
Canada:            $0.0052 per minute               $0.0125 per minute

For international rates: