Twinkle is a softphone for your voice over IP and instant messaging communcations using the SIP protocol. You can use it for direct IP phone to IP phone communication or in a network using a SIP proxy to route your calls and messages.

In addition to making basic voice calls Twinkle provides you the following features regardless of the services that your VoIP service provider might offer.

  • 2 call appearances (lines)
  • Multiple active call identities
  • Custom ring tones
  • Call Waiting
  • Call Hold
  • 3-way conference calling
  • Mute
  • Call redirection on demand
  • Call redirection unconditional
  • Call redirection when busy
  • Call redirection no answer
  • Reject call redirection request
  • Blind call transfer
  • Call transfer with consultation (attended call transfer)
  • Reject call transfer request
  • Call reject
  • Repeat last call
  • Do not disturb
  • Auto answer
  • Message Waiting Inidication
  • Voice mail speed dial
  • User defineable scripts triggered on call events
    E.g. to implement selective call reject or distinctive ringing
  • RFC 2833 DTMF events
  • Inband DTMF
  • Out-of-band DTMF (SIP INFO)
  • STUN support for NAT traversal
  • Send NAT keep alive packets when using STUN
  • NAT traversal through static provisioning
  • Persistent TCP connections for NAT traversal
  • Missed call indication
  • History of call detail records for incoming, outgoing, successful and missed calls
  • DNS SRV support
  • Automatic failover to an alternate server if a server is unavailable
  • Other programs can originate a SIP call via Twinkle, e.g. call from address book
  • System tray icon
  • System tray menu to quickly originate and answer calls while Twinkle stays hidden
  • User defineable number conversion rules
  • Simple address book
  • Support for UDP and TCP as transport for SIP
  • Presence
  • Instant messaging
  • Simple file transfer with instant message
  • Instant message composition indication
  • Command line interface (CLI)



Twinkle is available in Ubuntu universe repository by default, install it via Ubuntu Software Center.

Twinkle’s Homepage: