2011-02-08 14:56:35 
阿炯
LinPhone是一个IP电话工具，跨平台运行。它能够让你通过internet来查询朋友的IP，并通过IP相互打电话，在GPL协议下授权。
Linphone is a VoIP application available on PCs running Linux or Windows or Apple computers running Mac OS X and Android or iPhone mobile phones. It uses the Session Initiation Protocol for communication. Linphone uses GTK+ for GUI and on Linux it can be also run as a console-mode application. Of course, even though Linphone is a software tool, in order to use it, you’ll need some basic hardware, such as a headset and a microphone. And if you want to use Linphone as a complete phone system you’ll need an account with an Internet telephony service provider.
Linphone software running on an Android mobile phone
Audio codec support: Speex (narrow band and wideband), G.711 (u-law, a-law), GSM, and iLBC (through an optional plugin) Video codec support: H263-1998, MPEG-4, Theora and H.264 (thanks to a plugin based on x264), with resolutions from QCIF(176x144) to SVGA(800x600) provided that network bandwidth and cpu power are sufficient.
Features
* SIP user agent compliant with RFC3261
* Decoupling between liblinphone engine and graphical UI: allows to integrate linphone functionnalities in any graphical application.
* Audio with the following codecs: speex (narrow band and wideband), G711 (ulaw,alaw), GSM. Through additionals plugins, it also supports AMR and iLBC.
* Video with codecs: H263, H263-1998, MPEG4, theora and H264 (thanks to a plugin based on x264), with resolutions from QCIF(176x144) to SVGA(800x600) provided that network bandwidth and cpu power are sufficient.
* Supports IPv6
* Supports any webcam with a V4L or V4L2 driver under linux and Directshow driver on windows
* Text instant messaging and presence (using the SIMPLE standart)
* Addressbook
* DTMF (telephone tones) support using SIP INFO or RFC2833
* Understands SIP ENUMS (sip phone numbers using the naptr DNS service, without proxy)
* Echo cancelation using the great speex echo canceler
* Multiple SIP proxy support: registrar, proxies, outbound proxies
* Digest authentication
* Nat friendly: guesses NAT address for SIP messages, uses STUN for RTP streams
* Sound backends:
* Linux: ALSA, OSS, PulseAudio
* Windows: waveapi
* MacOSX: audio queues
* iPhone: AudioUnit
* Android sound system
* Efficient bandwidth management: the bandwidth limitations are signaled using SDP (b=AS...), resulting in audio and video session established with bitrates that fits the user's network capabilities.
* Can use plugins: to add new codecs, or new core functionalities, such as remote directory search of sip addresses for example.
* Compliant with open standarts:
最新版本：2.0
该版本最大的特色是支持多人同步呼叫，包括暂停、继续、转移、回音消除技术有所提高。
官方主页：http://www.linphone.org/