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.
Trunks list - it is an alternative of "failover trunks". There is a possibility to attach any existing trunks to ratecard and define a calling algorithm. Look into a ratecard.
Minutes limitation for trunks - this feature allows you to set a day limit for trunks in minutes. Look into a trunk.
Dial attempts - in case of using this feature A2Billing can make several attempts per each trunk if specific dialstatus returned. Conditions are configurable too. Look into a trunk.
Added "disabled" field into rates table. It allows to enable/disable rates quickly. Bunch action is also added.
Added link beetwen card and provider record. It is useful for avoiding dial loops. For example if some provider is a client at same time - the rate engine should not find any rates for this provider if it is dialing in.
Some new features added and might be useful.