Peers is a SIP User-Agent to help you communicate, a very simple softphone. It's a SIP User-Agent, written in java, it works on windows, linux and mac. It can be used with SIP servers like opensips or asterisk IPBX. It supports U-Law (G711) for media encoding, and it's free and documented!

Peers Features:
Running:
1. peers.home system property to run peers in several environments
2. Configuration:
3. an outbound proxy can now be configured in configuration file
4. media can now be activated or deactivated in configuration file

SIP:
1. support "sent-by" and "received" Via parameters
2. support 407 Proxy-Authenticate on REGISTER
3. support 401 and 407 on INVITE
4. support re-INVITEs (refresh target)
5. manage challenges on INVITEs

RTP:
1. support remote party update (ip address and port)
2. transport log file now contains real remote ip address and port
3. fixed media sending issue (replaced encoder with mobicents media server g711 encoder)

Requirements:
* Java

The license of this software is Free, you can free download and free use this phone software.