Making phone calls over the internet adds features and flexibility and saves money. Lots of money.
Voice over internet phone calls...
No more line rental or expensive foreign calls. Work from anywhere, but appear to be in your office and pick up all those incoming calls anyway. Call your colleagues for free. Receive your voice messages as email attachments (small sound files) and forward whatever, whenever, wherever... What's not to like?
Scale as required
Add or remove handsets easily and only pay for what's in use. Link to your mobile.
Use from wherever you are
Take your office phone number with you on location, or even to the beach!
Calls made using VoIP sound just as great (often better!) but cost far less.