Free telephone services are available on broadband
BT 'Fusion' access is available for anyone with a BT Fusion mobile telephone.
Also Skype (which can be download and installed free of charge).
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.