The A2Billing platform is a fully featured pre-paid and post-paid calling card platform built and designed on LAMP. (Linux, Apache, MySQL and PHP) The telephony interface is supplied by Asterisk, the open source telephony toolkit designed by Digium.
A PC or Server is required to run the software. The size and specification of the PC will be based on the number of concurrent calls that are expected to pass through the platform, and the codecs chosen by the calling card operator. Refer to the Digium website and [http://www.voip-info.org] for minimum recommended specifications.