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Cisco has the Unified Personal Communicator that will work with the Mac, but it requires Cisco Unified Presence. Your only option for a Mac softphone would be a 3rd party SIP client. I can't provide any guidance on that as I haven't tried to get a SIP softphone working with any express products.

Make phone calls using your PC or Mac Works with almost any VoIP gateway provider or office PBX Features include conferencing, recording, and voice commands Configure up to 6 telephone lines on Express Talk Express Talk works like a computer telephone. Call from your PC to any other computer with a softphone installed. Additional signup with a VoIP service provider to use Express Talk to call regular telephone numbers as well. Download Express Talk Softphone for Windows Combine Express Talk with other programs in our telephony suite such as Axon, a Virtual PBx System, to create a customized phone system to for your business.

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Softphone Features Make voice and video calls free between computers Supports PC to phone via a VoIP SIP gateway provider Place callers on hold (on-hold music included) Supports caller ID display and logging Includes a phone book with quick dial configuration Integrates with Microsoft Address Book Data compression, echo cancellation, noise reduction and comfort noise Supports emergency numbers calling (e.g. 911, 999, 000) Can be used with USB phones, Headsets, Microphones, a Webcam and a set of speakers, or a USB video phone Additional Business Features Configure up to 6 phone lines Call conferencing for up to 6 people Phone call recording Voice commands Call transfer Do Not Disturb Push to talk intercom Call Pickup allows you to answer on another extension

Linphone is an open source SIP client for HD voice/video calls, 1-to-1 and group instant messaging, conference calls etc. Available for iOS, Android, Windows, macOS and GNU/Linux. Free download iPhone SIP Client iPhone SIP Client for Mac OS X. IPhone SIP Client is uniquely designed and developed to add the power of making VoIP calls directly through the iPhone. A state of the art, easy to use SIP client Blink is the best real-time communications client using the SIP protocol. You can use it with many SIP providers, on the LAN using Bonjour and with SIP2SIP, a free.

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