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Express Talk is a free VoIP SIP based softphone for Mac OS X. it allows you to call other softphone users for free or normal telephones if you sign up to a SIP Gateway Service.

Features: <br>

<ul> <li>Configure up to 6 lines on the one phone with the ability to put calls on hold.</li> <li>Supports caller ID display and logging. </li> <li>Includes a phone book with quick dial configuration. </li> <li>Can be configured to work behind NATs and Firewalls. </li> <li>Includes data compression (GSM, uLaw, ALaw, PCM and G726), echo cancellation, noise reduction, comfort noise and more. </li> <li>Uses the standard SIP protocol so it can use a number of telephone gateways, SIP systems or other internet phone software. </li> </ul>