X-Lite for Mac

From Xten Networks, Inc.:

A FREE premium SIP softphone with many PBX-like features. Open standards-based design allows for maximum network interoperation and integration. VoIP networks are expanding at a blistering pace, X-Lite is ready.

X-Lite Features:

• Touch-tones [DTMF]
• 3 Lines
• Multiple Proxies
• Line Hold
• Inbound Call 'Ignore'
• Inbound Call 'Go to Voicemail'
• Call Forwarding URI/URL
• Voicemail URL
• Dial/ Redial/Hangup
• Dynamic CODEC Selection
• Caller ID [SIP ID]
• Call Timer
• Silence Threshold
• Backspace/Clear/Delete
• Mute
• Microphone & Speakers Levels
• Microphone & Speakers Meters
• Push-to-Talk
• Last Caller-ID
• Recent Calls Dialed
• Recent Calls Received
• Sound Device Selection
• Direct IP to IP Calling
• New Familiar-looking Menu
• Phonebook [Import/Export CSV]
• Speed Dial