Please Pay attention to INT Service Details:
This is an intelligent, symmetric and two-way service, using this service, not only you can call Tehran landline, but also you can receive calls from Iran too.
This service is monthly and will be renewed every 30 days.
There is no hidden fee, no connection fee.
This service is unlimited but there is a Fair usage Policy as a home user.
Monthly cost of this service 19.90 USD + 4.00 USD (Tax & surcharge) .