Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 and the ZRTP security protocols.

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