We work with your existing IT company (or we can recommend one) to install and configure 3CX on existing hardware or we supply small form factor PC to run 3CX on.
Local 3CX is ideal for companies where most of the phone will be located on one site. Only traffic to connections outside the organisation will go via the Internet connection, all other traffic is local to the internal network.
If your ADSL is used heavily then you will need a QoS Router or a dedicated ADSL connection.
We have a case study based on Local 3CX for Chartway Industrial Services