A2Billing is an open source class 4/5 soft switch with a lot a features including:

Customer Relation Management including online support & Customer Portal
Detailed dashboard giving at a glance statistic: Customer information, Refill information on, time periods, Payment information by month, Daily call statistics
Automatic E-Payment (PayPal)
Invoice, and invoice payment via online payment provider
Email notifications for low balance
Auto refill
Credit limit notifications by email
Billing options for DID based on subscription and/or dial in /out rate
Package offers, offering free minutes and calls to certain destinations
Flexible VoIP authentication methods: Username and password IP authentication 5+ digit prefix authentication
Capacity Limit & Failover trunk
Detailed CDR with Export to XML or CSV format
Selection of rates based on LCR (Least Cost Routing) or LCD (Least Cost Dialling)
Sell Rates with multiple options, including stepped billing
Commission agents supported
and much much more.

Service Description

initial configuration/setup
Dedicated IPv4
Free IPv6 Support
No long term commitment
Upgrade anytime
Secure datacentre
Low latency
99.99% Uptime SLA
24/7 Technical Support


Pi Telecom offers different hosting plans based on the maximum number of simultaneous calls.

Concurrent Calls