What is the role of SIP server ?
SIP Server convert the SIP transport from WebSocket protocol to UDP, TCP or TLS which are supported by all legacy networks. It also facilitates the use of rich serves such as phonebook synchronisation , file sharing , oauth in client .
How does WebRTC Solution traverse through FireWalls ?
NAT traversal across Firewalls is achieved via TURN/STUN through ICE candidates gathering .Current ice_servers are : stun:stun.l.google.com:19302 and turn:user@numb.viagenie.ca
What audio and video codecs are supported by WebRTC client side alone ?
Without the role of Media Server WebRTC solution supports Opus , PCMA , PCMU for audio and VP8 for video call.
RTCBreaker if enabled provides a third party B2BUA agent that performs certain level of codec conversion to H.264, H.263, Theora or MP4V-ES for non WebRTC supported agents.
What video resolution is supported by WebRTC solution ?
The browser will try to find the best video size between max and min based on the camera capabilities.
Options are : sqcif | qcif | qvga | cif | hvga | vga | 4cif | svga | 480p | 720p | 16cif | 1080p
We can also predefine the video size such as minWidth, minHeight, maxWidth, maxHeight.
What bandwidth is required to run WebRTC solution ?
We can set maximum audio and video bandwidth to use or use the browser’s ability to set it hy default at runtime . This will change the outgoing SDP to include a “b:AS=” attribute. Browser negotiates the right value using RTCP-REMB and congestion control.
List of Web based SIP clients
SIPML5 client by Dubango
Telestax WebRTC client
SIPJS with flash network support
JSSIP
MIT license 
SIP phones in Ubuntu / Linux
SFL phone
Yate SIP phone
Linphone
There are ready made build of Linphone for Windows , Mac and Mobile
Aletrnatively one can also build the Linphone from source
Installation of Linphone v4.1 for Desktop
apt-get install libqt53dcore5:amd64 libqt53dextras5:amd64 libqt53dinput5:amd64 libqt53dlogic5:amd64 libqt53dquick5:amd64 libqt53dquickextras5:amd64 libqt53dquickinput5:amd64 libqt53dquickrender5:amd64 libqt53drender5:amd64 libqt5concurrent5:amd64 libqt5core5a:amd64 libqt5dbus5:amd64 libqt5designer5:amd64 libqt5designercomponents5:amd64 libqt5gui5:amd64 libqt5help5:amd64 libqt5multimedia5:amd64 libqt5multimedia5-plugins:amd64 libqt5multimediawidgets5:amd64 libqt5network5:amd64 libqt5opengl5:amd64 libqt5opengl5-dev:amd64 libqt5positioning5:amd64 libqt5printsupport5:amd64 libqt5qml5:amd64 libqt5quick5:amd64 libqt5quickcontrols2-5:amd64 libqt5quickparticles5:amd64 libqt5quicktemplates2-5:amd64 libqt5quicktest5:amd64 libqt5quickwidgets5:amd64 libqt5script5:amd64 libqt5scripttools5:amd64 libqt5sensors5:amd64 libqt5serialport5:amd64 libqt5sql5:amd64 libqt5sql5-sqlite:amd64 libqt5svg5:amd64 libqt5svg5-dev:amd64 libqt5test5:amd64 libqt5webchannel5:amd64 libqt5webengine-data libqt5webenginecore5:amd64 libqt5webenginewidgets5:amd64 libqt5webkit5:amd64 libqt5widgets5:amd64 libqt5x11extras5:amd64 libqt5xml5:amd64 libqt5xmlpatterns5:amd64 qt5-default:amd64 qt5-doc qt5-gtk-platformtheme:amd64 qt5-qmake:amd64 qt5-qmltooling-plugins:amd64
Besdies these dont foeget to also install pip and pystache which is a templating system
sudo apt install python-pip
pip install pystache
And Doxygen which d tool for generating documentation from annotated C++ sources
apt install doxygen
Yasm assembler
sudo apt install yasm
V4L_LIBRARIES
sudo apt-get install -y v4l-utils
Get source Code
git clone https://gitlab.linphone.org/BC/public/linphone-desktop.git --recursive
To build without video or v4l support
sudo cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_V4L=0
The run build
sudo cmake --build . --target all
Debugging
Could NOT find Xv (missing: HAVE_X11_EXTENSIONS_XVLIB_H HAVE_XV_CREATE_IMAGE)
or
CMakeFiles/EP_ms2.dir/build.make:118: recipe for target '/home/altanai/linphone-desktop/WORK/WORK/desktop/Stamp/EP_ms2/EP_ms2-configure' failed
make[8]: *** [/home/altanai/linphone-desktop/WORK/WORK/desktop/Stamp/EP_ms2/EP_ms2-configure] Error 1
CMakeFiles/Makefile2:115: recipe for target 'CMakeFiles/EP_ms2.dir/all' failed
make[7]: *** [CMakeFiles/EP_ms2.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make[6]: *** [all] Error 2
or
[ 57%] Performing configure step for 'EP_ms2' loading initial cache file /home/altanai/linphone-desktop/WORK/WORK/desktop//tmp/EP_ms2/EP_ms2-cache-RelWithDebInfo.cmake CMake Error at CMakeLists.txt:322 (message): Could not find a support sound driver API. Use -DENABLE_SOUND=NO if you don't care about having sound.
Install sound drivers
sudo apt-get install libpulse-dev pulseaudio libasound2-dev pavucontrol alsa-lib
Failing on MS compilation on Performing configure step for ‘EP_ms2
Ref :
- https://gitlab.linphone.org/BC/public/linphone-desktop
- https://www.linphone.org/technical-corner/linphone
Windows Operating system SIP software
Xlite is well known SIP softphone for windows dessktop
Xlite new version
Kapanga SIP softphone
It is also runnable on Linux desktop through windows compatibility softwares like wine
FreeSwitch Communicator
comes along with the Freeswitch Media Server
Boghe SIP RCS client
Jitsi SIP phone
MAC SIP software
idoubs desktop SIP RCS client for Mac
iOS SIP phone applications
Linphone for ios
Android SIP applications
Sipdroid for Android
opensource
Supporfts SIP stack and compatible with most of the SIP servers
