Offices, and Home users that have branch offices, partners, friends , family that have also suscribed the SwiftTalk Internet phone service can call each other free of charge.* Simply Purchase 2 or more certified VOIP equipment, purchase call credit and start making inter-branch calls free. You can also attach a US or UK number ** to the phone lines so that you receive both inter-branch and external calls using the same equipment Note that you can still make your international calls using these same equipment Note: * Promotional offer, a low fixed monthly fee, or a very low per minute call rate may apply later ** A flat monthly fee, deducted off your call credit will apply.