Telephone

A VoIP program which allows you to make phone calls over the internet. It can be used to call regular phones via any appropriate SIP provider. If your office or home phone works via SIP, you can use that phone number on your Mac anywhere you have decent internet connection. Telephone is really easy to use. It’s for the Mac only.

Blink

Integrated with Audio, Blink provides Instant Messaging and File Transfer functionality based on SIP SIMPLE standards.

About Twinkle

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.

Twinkle is available for download.

Twinkle is available for Linux only (GPL license).

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

If you want to know more about VoIP security and ZRTP, then you can read this paper.

Audio codecs

Twinkle supports the following audio codecs.

• G.711 A-law (64 kbps payload, 8 kHz sampling rate)
• G.711 μ-law (64 kbps payload, 8 kHz sampling rate)
• GSM (13 kbps payload, 8 kHz sampling rate)
• Speex narrow band (15.2 kbps payload, 8 kHz sampling rate)
• Speex wide band (28 kbps payload, 16 kHz sampling rate)
• Speex ultra wide band (36 kbps payload, 32 kHz sampling rate)
• iLBC (13.3 or 15.2 kbps payload, 8 kHz sampling rate)
• G.726 (16, 24, 32 or 40 kbps payload, 8 kHz sampling rate)

Note: the payload bandwidth for the speex codecs are measured on the constant bit rate variant without voice activation detection.

For all codecs the following preprocessing options are available to improve quality at the far end of a call.

• Automatic gain control (AGC)
• Noise reduction
• Voice activity detection (VAD)
• Acoustic echo control (AEC) [experimental]

Audio drivers

Twinkle supports the following audio drivers.

• Open Sound System (OSS)
• Advanced Linux Sound Architecture (ALSA)

Presence

Twinkle supports basic presence functionality using a presence agent that must be offered by your SIP provider.

Only the basic online and offline presence states (PIDF) are supported. Your buddy lists are stored locally on your computer.

Instant messaging

Twinkle has basic instant messaging capabilties. You can send plain text messages. You can receive plain text or rich text (html) messages.

KDE goodies

These features are only available when your system provides KDE libraries. Twinkle can also run on systems without KDE libraries, but you will lack these features.

• Balloon popup from system tray when a call comes in
• Interface to KAddressBook: dial phone numbers from your address book
• Display names from KAddressBook on incoming calls
• Display photos from KAddressBook on incoming calls

Languages

Twinkle is available in the following languages

• Czech, Dutch, English, French, German, Swedish

X-Lite welcomes you to the world of softphones!

Combining voice calls, video calls and Instant Messaging in a simple interface, CounterPath's X-Lite helps you seamlessly transition from a traditional phone environment into the world of Voice over IP.

Whether you’re having a simple voice conversation, saying hello to loved ones over video or chatting with friends over IM, you’ll soon see why having a softphone on your desktop or laptop is the ultimate communications experience.

X-Lite Features

• Open Standards and Session Initiated Protocol (SIP) based call signaling allows X-Lite to work with a wide number of networks
• Comprehensive Personal Address Book, including detailed calls lists and history
• Zero-Touch Configuration of your USB headset or other audio/video devices
• IM and Presence Management
• Multi-party Voice and Video Conferencing

X-Lite Benefits

• Whether your friends or family live around the corner or across the country, use audio and video conferencing to stay in touch
• Use the Address book to manage your contacts information and to check if they are online
• Instant Message people in your address book when you don't really need to talk