Twinkle – KDE Soft-phone using the SIP protocol

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http://ubuntuguide.net – 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 whe (HowTos)