If you make a considerable amount of long distance calls switching to VoIP will provide you with considerable cost savings.
Ọ bụrụ na nzukọ gị na-eji nkwurịta okwu ekwentị eme ihe dị ukwuu, na-agbanwe site na PBX gaa VoIP ga-ewetata ego nkwupụta gị site na nnukwu ego.