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VoIP Softphones - Софтуерни телефони


Softphone for Mac - Telephone 0.14

Telephone 0.14

About 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.

What’s New in this Version
- Pause iTunes during calls.
- Redial.
- Hang-up button.
- Dock icon badges.
- Simplified account setup.
- Custom account names.
- Option to close call windows automatically.
- “Mic muted” does not disappear.
- DNS SRV is enabled by default.
- Automatically connect when network becomes available.
- More responsive user interface.

Telephone

System Requirements

  • Mac OS X 10.5 or later
  • Decent network connection

Download Details

Company:
NA
Version:
0.14
Post Date:
June 23, 2009
License:
Freeware
File Size:
2.3MB
URL Type:
Download
Download ID:
23602
 
Download 2.3MB

Softphone for Linux - Twinkle

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

Softphone for Windows - X-Lite

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

Softphone from Wikipedia

Softphone

From Wikipedia, the free encyclopedia

In computing, a softphone is a software program for making telephone calls over the Internet using a general purpose computer, rather than using dedicated hardware. Often a softphone is designed to behave like a traditional telephone, sometimes appearing as an image of a phone, with a display panel and buttons with which the user can interact. A softphone is usually used with a headset connected to the sound card of the PC, or with a USB phone.[1]

Contents

Softphone Applications

A typical application of a softphone is to make calls via an Internet telephony service provider to other softphones or to telephones. Service providers may offer PC-to-PC calls for free; PC-to-phone and phone-to-PC calls are usually not free.

Another type of softphone connects to a private branch exchange (PBX) through a local area network (LAN) and is used to control and dial through an existing hardware phone. This is often used in a call center environment to make calls from a central customer directory, and to show information on the screen about which customer is calling, instantly providing the operator with details of the relationship between the caller and the company using the call center. Some countries do not allow this PBX.

It's important to differentiate softphones from services based on softphones. Skype, Google Talk, and Vonage are Internet telephony service providers having their own softphones that you install on your computer. Unfortunately these three major providers are not interoperable, and you can't place a direct call between them.

Communication Protocols

To communicate, both end-points must have the same communication protocol and at least one common audio codec. Most service providers use a communication protocol called SIP (Session Initiation Protocol) by IETF, except Skype which is a proprietary system and Google Talk which is based on XMPP. Some softphones also support the Inter-Asterisk_eXchange protocol (IAX). Examples of SIP softphones can be found in the VoIP software category and at Comparison of VoIP software.

Softphone Features

A typical softphone has all standard telephony features (DND, Mute, DTMF, Flash, Hold, Transfer etc) and a lot of new ones like Presence, Video, Wideband Audio and more. The minimum codecs set is G.711, GSM and iLBC. Softphone vendors may offer more codecs and different feature set.

Softphone Requirements

To make voice calls over Internet, you should have

  • Any modern PC with a microphone and a speaker, or with a headset, or with USBphone.
  • Reliable Internet connectivity like DSL, WiFi, cable or LAN. 28.8 dial-up modem may be enough if you use a codec compressing the speech to this bandwidth.
  • Account with an Internet telephony service provider or IP PBX.

See also

References

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