This will give you a phone system with all of the upto date facilities expected from todays systems without the capital expense of a full on site system. it makes use of either a normal ADSL connection or preferably a sip trunk connection for better call quality.
We have connections to companies that supply this type of system and can look at your individual requirements and specify the system required.
You can use any IP phone with hosted systems. depending on requirements we would normally suggest Yealink as these are very good value for money. If video phones are required these can be accommodated.