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.
Cisco SPA525G is a high-tech IP-phone, designed to work in conjunction with five lines. This phone is equipped with a large color LCD display with a diagonal of 3.2 "and refers to telephones of business class. If your company is using all the advantages of modern IP-telephony, this device will be the best choice.