Phone-to-Phone Telephony Service

Phone-to-phone service  requires that one party have a telephone adapter device that plugs into their high-speed Internet connection or router.  A conventional phone is plugged into this adapter.  Phone-to-phone VOIP service supports both incoming and outgoing calls. 

PC-to-Phone Telephony Service

PC-to-phone telephony service requires that the person making the call have VOIP software installed on their computer.  The service can be used to make inexpensive outgoing long distance telephone calls, however, calls can't be received from conventional phones. 

PC-to-PC Telephony Service

PC-to-PC telephony service requires that the person making the call and the person receiving the call have VOIP (Voice Over Internet Protocol) software installed on their computers.  They both must be connected to the Internet and be expecting the call.