ALSA
backend for KMix is still available, use export KMIX_PULSEAUDIO_DISABLE=1
to force its use even if PulseAudio is detected.
SIP
based telephone system, and for calling remote users over the Internet without the need for a service provider or central directory service. With SIP Witch and an SIP-compatible softphone such as Twinkle or Empathy, users can replace propriety VoIP solutions with secure, direct peer-to-peer communications using entirely free software.