If you have users that you have little or no contact with, or where fraudulent usage can be an issue, it might be worth looking at Pre-paid solutions. With the pre-paid model we need to access a users funds before the call is made in order to see how much cash is available for the call to be made. Next, once the call destination is known, we should start a timer to disconnect the call (or more userfriendly, interrupt the call with an announcement) and finally close the deal.

Some considerations when creating a calling card application:

• take care of multiple calls using the same credentials (PIN or username)
• the SIP protocol does not allow for recognition of a client that was disconnected
• cut off the call when the credit has dropped to 0
• the hard part is to correctly rate a call, e.g. attaching the correct tariff

Software supporting prepaid applications:

• AreskiCC CallingCard Application - Prepaid calling card application based on Postgres
• A2billing Hosted Calling Card: Hosted Prepaid application for VoIP Provider and Calling card
• AstBill - Billing, Routing and Management software for Asterisk and MySQL - AstBill is open source software licensed under the GPL
• astCDRview - astCDRview is an open source, licensed under GNU/GPL, lightweight, Web-based, multi-language Asterisk SQLite CDR viewer that supports multiple outgoing carriers, multiple incoming numbers, billing, an address book, and extensions
• Asterisk Prepaid Billing Software by Alepo - Real time billing for large scale Asterisk deployments
• Asterisk-Phonecard: Asterisk Phonecard - Prepaid calling card application based on MySQL
• AsterBill: Prepaid application for VoIP Provider and calling card - Asterisk
• ASTCC: Asterisk Calling Card Solution - Another approach for full features Pre-paid Calling Card application based on AGI
• ASTCCSQLite: ASTCC variant that doesn't need Mysql, just DBD::SQLite
• Asterisk addon rate-engine: An alternative billing solution from Trollphone
• Asterisk callingcard
• Asterisk Billing Software from Aradial - Aradial Asterisk Calling Cards AradialVOIP
• Asterisk Prepaid Calling Cards ControlAP Pro (wifi hotspot billing software) now includes a web based interface for printing calling cards in multiple formats. Asterisk integration and built-in database server. Supports most database servers and platforms.
• Modified-Prepaid-Application - not maintained anymore - resulted into the CallingCard Applications
• MOR Advanced Billing solution. Retail/Wholesale. For VoIP providers/Call Centers/etc. LiveCD available. Homepage
• Diamondcard Prepaid Calling Card Platform
• Asterisk bounty callingcard to MySQL - resulted into the CallingCard Applications
• CallingCard Applications - Set of 3 Applications to get your Calling Card business up and running (PrepaidAuthCID, PrepaidAuthPIN and PrepaidCall)
• Calling Card and affordable prepaid billing platfom - Real time billing for large scale Asterisk deployments. Demo available now.
• Prepay, Postpay, Flat Rate or Flat Rate w/ Bucket billing system and IP-Centrex management platform - Scalable archetachture with one management platform that manages multiple Asterisks. Easy to scale from small to big deployment.
• PaypalAstcc - Paypal script for Astcc, use Astcc with Paypal to create a complete prepaid solution.
• YakaVOIP - YakaVOIP is a fully integrated, open-source -NOT FREE-, web-based, user friendly billing and administration interface for Asterisk and Voice-Over-IP. It leverages existing open-source technologies and ecompases 3rd party payment gateways like Paypal, MyGate, Moneybookers & Google Pay.

Professional Software:

iPhonica, LLCiPhonica's Class4 IN & Prepaid Platform is a Modular, Flexible & Scalable system that enables Broadband Voice Operators and International Telephony Service Providers (ITSP) to deploy a variety of Telephony Services efficiently & cost effectively.
Inspiration Software Ltd iSoftSwitch has come with Integretion of Asterisk & GnuGK.Radius enable billing & authentication.
http://www.beavoipprovider.com
http://www.supertec.com/solutions

Reviews

Pros and Cons of CC apps from people who are using them in production
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See Also

• Asterisk Billing
• VOIP Billing
• Open Source Billing Systems
• http://www.asteriskbilling.com - Free resources to help locate the best Prepaid Billing software for your company.