Twinkle is a free and open source software application for Voice over Internet Protocol (VoIP) voice communications in IP networks, such as the Internet.  It is designed for  Linux operating systems and uses the Qt toolkit for its graphical user interface. For call signaling it employs the Session Initiation Protocol (SIP). It also features direct IP-to-IP calls. Media streams are transmitted via the Real-time Transport Protocol (RTP) which may be encrypted with the Secure Real-time Transport Protocol (SRTP) and the ZRTP security protocols.
Since version 1.3.2 (September 2008), Twinkle supports message exchange and a
buddy-list feature for presence notification, showing the online-status of predefined communications partners (provider-support needed).
Supported audio formats [ edit ]
G.711 A-law: 64 kbit/s payload, 8 kHz sampling rate G.711 μ-law: 64 kbit/s payload, 8 kHz sampling rate
G.726: 16, 24, 32 or 40 kbit/s payload, 8 kHz sampling rate
GSM: 13 kbit/s payload, 8 kHz sampling rate
G.729: 8 kbit/s payload, 8 kHz sampling rate
iLBC: 13.3 or 15.2 kbit/s payload, 8 kHz sampling rate
Speex narrow band: 15.2 kbit/s payload, 8 kHz sampling rate Speex wide band: 28 kbit/s payload, 16 kHz sampling rate
Speex ultra wide band: 36 kbit/s payload, 32 kHz sampling rate
See also [ edit ]
References [ edit ]