Phoner is a freeware application that enables voice connections to landline, cellular network, and VoIP. It can be used as softphone on your computer and mobile devices attached to analogue or digital subscriber lines and SIP clients. This program is useful for private or commercial environment, you can use it to keep in touch with family and friends or even your employees. It supports the following modes: VoIP/SIP, CAPI, TAPI, and PhonerLite. If the PC is connected to a PBX or PSTN with and ISDN terminal adapter, all supplementary services supported by CAPI can be used. Download this freeware downloading it from this site.