Plenty of business companies use free Asterisk software and place it on their server, thus creating a cut-rate IP-PBX. They use manuals provided on setting up the extensions, and occasionally there are lots of discrepancies. Finding out how to install a dial plan or call flow, the set of regulations detailing how the switch deals with inbound and outbound calls is very difficult.
Abbeynet is a leading European company focused on state-of-the-art VoIP technologies based on the SIP standard, including integration between fixed and mobile networks in an all-IP context and web-based VoIP service architectures.