Flexisip is a complete, modular and scalable SIP server suite written in C++14, comprising proxy, presence and group chat functions.
It also includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.
Flexisip instances can be deployed on server machines to run a SIP VoIP service.
The free linphone.org SIP service has run on Flexisip since 2011, and enables Linphone users to create SIP addresses in order to connect with each other.
It can also be embedded and run perfectly on small hardware systems.
Secure RTP (SRTP) and UST Reference Implementations
X
SQLite3
Library for handling SQlite3 file
X
libmysql-client
Client library for MySQL database.
X
Hiredis
Redis DB client library, used for Registrar DB and communications between Flexisip instances of a same cluster. (-DENABLE_REDIS=YES)
X
Protobuf
Needed for migration from legacy registrar database format. (-DENABLE_PROTOBUF=YES)
X
NetSNMP
SNMP library, used for SNMP support. (-DENABME_SNMP=YES)
X
XercesC
XML parser. (-DENABLE_PRESENCE=YES)
X
Compilation
Required build tools
C and C++ compiler. GCC and Clang are supported as long as they are recent enough for building C++14 code.
On Redhat/CentOS 7, we recommend installing gcc-7 from https://www.softwarecollections.org/en/scls/rhscl/devtoolset-7/ . The default gcc-4.8 is not sufficient.
CMake >= 3.13
make or Ninja
Python >= 3
Doxygen
Git
Building Flexisip with CMake
Create a build directory and configure the project:
Check CMakeLists.txt to know the list of the available options and their default value. To change an option, you just need to invoke CMake again by specifying the option you need to change only.
For instance, to disable the presence server feature:
cmake ./build -DENABLE_PRESENCE=OFF
make -C ./build -j<njobs>
You may also use ccmake or cmake-gui utilities to configure the project interactively:
ccmake ./build
make -C ./build -j<njobs>
Building RPM or DEB packages
This procedure will make a unique RPM package containing Flexisip and all its dependencies and the according package for debug symbols.
The following options are relevant for packaging:
CMAKE_INSTALL_PREFIX
The prefix where the package will installed the files.
SYSCONF_INSTALL_DIR
Where Flexisip expect to find its default configuration directory.
CMAKE_BUILD_TYPE
Set this to “RelWithDebInfo” to have debug symbols in the debuginfo package.
Flexisip can also be compiled with Nix. You can obtain a development shell with: (from the root of the repository)
nix-shell
Nix makes it easier to have a reproducible development environment on
any Linux distribution, and doesn't interfere with other installed tooling.
It is just an additional, optional way to build flexisip.
Note to maintainers
At the exception of shell.nix, .nix files should live inside the nix/ folder.
All .nix files should be formatted with nixpkgs-fmt.
Configuration
Flexisip needs a configuration file to run correctly.
Use ./flexisip --dump-all-default > flexisip.conf to make a documented
default configuration file.
Developer notes
With sofia-sip, you have the choice between msg_dup() and msg_copy(),
sip_from_dup() and sip_from_copy(), etc.
The difference isn't well documented in sofia-sip documentation but it is
important to understand that:
*_dup() makes a copy of the structure plus all included strings inside.
*_copy() just makes a copy of the structure, not the strings pointed by it. These functions are
dangerous; use *_dup() versions in doubt.
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