It is a call which is made over internet protocol (VoIP). For example,
one can call using Google Voice to other recipient located miles away. Such
call can also be international.
Panasonic KX-NCP, as well as Panasonic KX-TDE are IP-systems using the principle of IP-packet switching and supporting major protocols of IP-telephony. Panasonic KX-NCP offers all benefits and functionality KX-TDE series.