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.

Features

In addition to making basic voice calls Twinkle provides you the following features:

* 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)

VoIP security

* Secure voice communication by ZRTP/SRTP
* MD5 digest authentication support for all SIP requests
* AKAv1-MD5 digest authentication support for all SIP requests
* Identity hiding

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