Java SIP softphone
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Latest commit af1aab3 Oct 22, 2016 Yohann Martineau DTMF end packets should not increase timestamp
closes #29


                   Peers: java sip softphone


This software is released under GPL License version 3 or
any later version. Please read this license in gpl.txt if
not already done.


Peers is a software phone (softphone) compatible with the
following specifications:
 - RFC 3261 (SIP),
 - RFC 4566 (SDP),
 - RFC 3550 (RTP),
 - RFC 3551 (RTP Audio/Video profile),
 - RFC 2617 (Digest Authentication),
 - RFC 4733 (DTMF),
 - ITU-T G.711 (PCMU, PCMA)
You should easilly retrieve those specifications on internet with
your favorite search engine.


This software has been developed using Oracle Java Development Kit
version 7. You should install the latest Java Runtime Environment
on your computer if you just want to run the application. If you
want to compile the sources yourself, you should use the JDK. In
both cases, you can download the installation files here:


Your SIP account credentials can be configured in conf/peers.xml.
Please read comments in this file for configuration details.
This configuration file is ruled by a grammar file: peers.xsd.
Thus to modify this file, you can use jEdit with XML and Error list
plugins. You can download jEdit here:
This provides xml completion and grammar checking which can be
very useful to avoid simple configuration errors.
You can also configure your SIP account using graphical user


If you are a Windows user you can use the .bat batch script in root
directory, if you use any Unix compatible sytem, you can use the
.sh script. You can also double click .jar file. You can then call
any IP address using SIP protocol, if the remote host does not listen
on the default SIP port (5060), you can use the following example URI:
For some softphones, it is necessary to add a userpart to the called
sip uri, for example:

If you configured a sip account in configuration file or using gui,
you can also place calls with usual sip uris:

Advanced users can run several peers instances on the same computer.
In this case a folder should be created in peers root directory for
each peers instance. This folder should contain three directories:
conf, logs and media. conf should contain peers.xml and peers.xsd for this
instance. peers.xml will need to be updated with this instance
parameters, peers.xsd can be copied from root conf directory. You will
need to do this for each instance. <media> parameter in configuration file
should be activated for at most one peers instance, this avoids comfusion
in microphone capture and sound playback. You should also check that
SIP and RTP ports are not the same in each configuration file.

Here is an example configuration:


Once all those files have been created and updated, each instance can
be run providing a java system property giving peers home directory:

  java -classpath build/classes -Dpeers.home=user1 net.sourceforge.peers.gui.MainFrame

As a Main-Class has been defined in jar manifest, you can also use the following
command line:

  java -jar build/peers.jar -Dpeers.home=user1 net.sourceforge.peers.gui.MainFrame


2007-11-25 0.1 First release

minimalist UAC and UAS.

2007-12-09 0.1.1 First release update

moved startup scripts in root directory

2008-03-29 0.2 Second release

New features:
 - provisional responses (UAC and UAS),
 - CANCEL management (UAC and UAS), updated GUI with provisional stuff
 - new Logger which enables network traffic tracing and classical log4j-like
   logging in two separate files
Bugs fixed:
 - 1900810 MTU too small management

2008-06-08 0.3 Third release

New features:
 - register management (initial register, register refresh, unregister)
 - authentication using message digest (RFC2617)
Improved features:
 - media capture/sending using pipes and three threads
 - using TestNG for tests
 - no singleton is used anymore
 - xxxRequestManagers and xxxMethodHandlers are instanciated only once for
   uas and uac
 - provisional responses can create or update dialog info (remote target, etc.)
Bugs fixed:
 - 1994625 provisional responses with to-tag

2009-09-23 0.3.1 Peers resurrection

New features:
 - Running:
   - peers.home system property to run peers in several environments
 - Configuration:
   - an outbound proxy can now be configured in configuration file
   - media can now be activated or deactivated in configuration file
 - SIP:
   - support "sent-by" and "received" Via parameters
   - support 407 Proxy-Authenticate on REGISTER
   - support 401 and 407 on INVITE
   - support re-INVITEs (refresh target)
   - manage challenges on INVITEs
 - RTP:
   - support remote party update (ip address and port)
Improved features:
 - transport log file now contains real remote ip address and port
 - fixed media sending issue (replaced encoder with mobicents media server
   g711 encoder)

2010-12-13 0.4 Peers GUI

New features:
 - GUI:
   - update sip account settings in account frame with no modification in files
 - SIP:
   - 3102136 keep-alives sent and answered
   - 3109472 added rport management based on RFC 3581
   - 3031364 added OPTIONS method management
 - RTP:
   - 2934223 support RFC 4733 outgoing telephone-events (DTMF)
   - 3107231 added PCMA (G711 A-law) codec
Improved features:
 - gui complete refactoring, now using clean events between sip core and gui
Bugs fixed:
   - 3032080 no media on pickup
   - 2864885 multiple challenged calls
   - 3098214 start CSeq at 1 instead of 0

2011-05-19 0.4.1 Bug fixes

Bugs fixed:
 - GUI:
   - 3155571 tuijldert: update dialog state before gui notification
 - SIP:
   - 3137803 tuijldert: client transaction synchronization on responses reception
   - 3285107 added authentication on bye request

2011-07-04 0.4.2 Bug fixes

Bugs fixed:
 - SIP:
   - 3325451 cannot hangup with asterisk
   - 3324115 ACK does not contain Authorization header

2011-09-06 0.4.3 Various improvements

New features:
 - SIP:
   - manage opaque parameter in challenge
   - use same tag in From header between original and authenticated INVITE
   - support incoming INVITEs and reINVITEs with empty body

Bugs fixed:
 - SIP:
   - 3392342 bad CANCEL sip request when other party doesn't picking up

2014-05-01 0.5 Maven release

 - moved source code from sourceforge subversion repository to git hosted
   on github
 - now using maven with multiple modules to build peers
 - updated doc
 - simplified SIP API


Yohann Martineau