Voice over IP  (VoIP, and more specifically, SIP trunking) is the dominant trend in business telephone service, consolidating voice and data onto a single circuit. When voice “call paths” and data traffic share the same path (“transport”) to your office, overall bandwidth utilization is improved—with potential cost savings compared to separate voice and data circuits. VoIP call plans often bundle inbound and outbound calling in ways that de-emphasize geography to make local, domestic long distance and international calling affordable for businesses.