Phoner

Phoner and PhonerLite are softphone applications for Windows operating systems available as freeware. Phoner is a multiprotocol telephony application supporting telephony via CAPI, TAPI and VoIP, while PhonerLite provides a specialized and optimized user interface for VoIP only. Beside the different user interface focus both programms share the same code base.

Both programs use the Session Initiation Protocol for VoIP call signalisation. Beside of server based infrastructure, direct IP to IP calls are supported too. Media streams are transmitted via the Real-time Transport Protocol which may be encrypted with the Secure Real-time Transport Protocol (SRTP) and the ZRTP security protocols. Phoner provides as well an interface for configuring and using all supplementary ISDN services provided via CAPI and thus needs an ISDN terminal adapter hardware installed in the computer.

Phoner and PhonerLite support IPv4 and IPv6 connections by using UDP, TCP and TLS.