This blog post will explain what a SIP enabled softswitch is and what is has to do with calling cards. It is software that enables call routing via the SIP protocol. This type of software is primarily used for providing calling card services. A softswitch can handle class 4 and 5 connections. Class 4 connections are between internet telephony service providers and the company. That would allow the management of calls that are routed between different providers. Class 5 connections deal with the customers. Customers are allowed to dial an access number to get to an automated menu. A calling card user would have to enter a PIN at a menu and make a call. That call would be routed depending on the users balance. Features that are needed by a softswitch to provide calling card services are billing, routing, PIN verification, and an interactive voice response system. Customers make calls and the duration of the call is deducted from their prepaid balance. Calls from a customer have to be routed to another provider or PSTN network. Calling cards are authenticated by PIN verification. Voice menus will have to be provided to a calling card user to verify their PIN and hear account information. There are a few advantages of using a class 4 & 5 softswitch for providing calling card services. Several calls can be handled at the same time. SIP trunking eliminates using hardware.