Some ISPs (internet providers) block or slow down VoIP traffic, sometimes because they offer their own telecoms services. In addition, although VoIP traffic requires little bandwidth it is affected by latency so a heavily used connection may result in call quality issues.
For multi-user systems or where the existing internet connection is used heavily, we recommend and can provide a dedicated VoIP optimised internet connection. Simply connect your InteliBox and your phones can connect securely to your system with a dedicated connection.