A Softphone is a software app that mirrors the functionality of your Hosted VoIP service, allowing you to use your desktop computer, tablet, or smartphone device as if it were your handset at the office. The benefits of using a softphone on your smartphone are not having to worry about roaming, or long distance charges, provided you have access to a WAN in the vicinity.
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A softphone is a software program for making telephone calls over the Internet using a general purpose computer rather than dedicated hardware. The softphone can be installed on a piece of equipment such as a desktop, mobile device, or other computer and allows the user to place and receive calls without requiring an actual telephone set. Often, a softphone is designed to behave like a traditional telephone, sometimes appearing as an image of a handset, with a display panel and buttons with which the user can interact. A softphone is usually used with a headset connected to the sound card of the PC or with a USB phone.