ConTagged is a web-based address book for small companies written in PHP.
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Open Source VOIP Billing Platform ASTPP is a billing solution for Freeswitch and Asterisk. It supports pre-paid and post-paid billing with call rating and credit control. It also provides many other features such as calling cards, least cost routing (LCR), did management, resellers, callbacks, etc. ASTPP is able to integrate with OSCommerce to provide a Web store for your users to purchase calling cards and sign up for VoIP accounts.
Open source billing and invoicing
A2Billing is a telecom switch and billing system capable of providing and billing a range of telecom products and services to customers such as calling card products, residential and wholesale VoIP termination, DID resale and callback services.
Pbxinaflash Hospitality Management System