VoIP (VoIP Over IP) is a technology which allows you make phone calls over a computer network. We support connection of User Extensions using VoIP technology. The phones sit on your desk and work just like any business phone.
Only SIP compatible VoIP phones will work, SIP is the most widely used type of VoIP. We only provide support for Yealink phones. Other VoIP phones (such as Grandstream, Grandstream Wave ap, MicroSIP software) are known to work, but we don't provide support or help with configuration. Yealink phones are generally available through online retailers such as amazon, dabs or ebay (we don't sell them).