Free telephone services are available on broadband
An example is Skype (download and install free ?).
Another example is
Logitech (cameras / microphones also compatible with Skype).
Using these services requires the other 'party' to have installed a similar program but on-line payment facilities are available to enable 'dial up' to 'conventional' landline or mobile telephones.
A microphone is required
and the built in speakers can be used.
A camera or combined camera / microphone enables video and audio communication with friends and relatives.