A call shop is a business that provides physical phones for the purpose of making long-distance telephone calls. There are two main types of call shop payment methods; prepaid and postpaid.
Asterisk PBX, Asterisk Billing (A2Billing), VOIP, Linux OS, Servers. OpenSER, SER, FreeRadius, Mediaproxy, Asterisk Billing (A2Billing), Radius Billing,VOIP, Linux OS, Servers.
Read more