In the field of communication people were happy to have the letter system so that they could have messages delivered across nations. But its delivery system was totally unreliable and always late. Then the engineers ans scientists came with telegraph, which was fast and reliable but very complicated. So this brought the need and hence invention of telephones, but in its initial stage it was very expensive mode of communication. So now there was the need of getting them to reasonable price ranges. Here cheap international calls came into existence.
Have you ever imagined how we humans would have communicated with each other if there have been no communication equipments? It is hard to even imagine also. Thus, for enhancing the communication experience and for providing global connectivity, innovative tools like conferencing phones are being manufactured.