Triplay ISP billing system internet voip iptv hotspot
Unified Communications System - PBX System
Free billing to Asterisk
Cyber-wrt pbx is embedded system in DD-Wrt router
billing for asterisk
Information on Asterisk cdr like ASR, ACD, Billing duration 'billsec',
Call Billing for Asterisk based in www.AsterCRM.com but free