We can offer small callshop/calling card solution.

Short about features:
Realtime billing
Blocking of call cabins when no customer (calls not allowed)
Prepaid and postpaid
Notification to sip phones (destination, time left, money left)

Cost - just $400 per server and about $130 / SIP phone (but you can use yours phones)

Additionally it can be easy used together with calling card solution, with analog lines (FXO), ISDN BRI or PRI (E1, T1). Just need additional board.

Interesting? Contact us - voip-solutions@yandex.ru