diff --git a/pkgs/applications/networking/instant-messengers/linphone/default.nix b/pkgs/applications/networking/instant-messengers/linphone/default.nix
index b155f3129642..b1927395a570 100644
--- a/pkgs/applications/networking/instant-messengers/linphone/default.nix
+++ b/pkgs/applications/networking/instant-messengers/linphone/default.nix
@@ -1,61 +1,239 @@
-{ stdenv, intltool, pkgconfig, readline, openldap, cyrus_sasl, libupnp
-, zlib, libxml2, gtk2, libnotify, speex, ffmpeg, libX11, libsoup, udev
-, ortp, mediastreamer, sqlite, belle-sip, libosip, libexosip, bzrtp
-, mediastreamer-openh264, bctoolbox, makeWrapper, fetchFromGitHub, cmake
-, libmatroska, bcunit, doxygen, gdk-pixbuf, glib, cairo, pango, mbedtls
-, python, graphviz, belcard, bcg729
-, withGui ? true
+{ bcg729
+, bctoolbox
+, bcunit
+, belcard
+, belle-sip
+, belr
+, bzrtp
+, cairo
+, cmake
+, cyrus_sasl
+, fetchFromGitLab
+, fetchurl
+, ffmpeg
+, gdk-pixbuf
+, glib
+, gnused
+, graphviz
+, gtk2
+, intltool
+, lib
+, libexosip
+, liblinphone
+, libmatroska
+, libnotify
+, libosip
+, libsoup
+, libupnp
+, libX11
+, libxml2
+, makeWrapper
+, mbedtls
+, mediastreamer
+, mediastreamer-openh264
+, mkDerivation
+, openldap
+, ortp
+, pango
+, pkgconfig
+, python
+, qtbase
+, qtgraphicaleffects
+, qtquickcontrols2
+, qttranslations
+, readline
+, speex
+, sqlite
+, stdenv
+, udev
+, zlib
+  # For Minizip 2.2.7:
+, fetchFromGitHub
+, libbsd
 }:
+let
+  # Linphone Desktop requires Minizip 2.2.7. Nixpkgs contains a very old version
+  # from the time when it was part of zlib. The most recent release of Minizip
+  # is currently 2.9.2 but Linphone Desktop didn't work with that. So, even if
+  # we added most recent Minizip version to nixpkgs, probably Minizip 2.2.7 is
+  # only needed here and we shouldn't add this semi-old version to
+  # all-packages.nix. Therefore, just define it here locally.
+  minizip2 = stdenv.mkDerivation rec {
+    pname = "minizip";
+    version = "2.2.7";
 
-stdenv.mkDerivation rec {
-  pname = "linphone";
-  version = "3.12.0";
+    disabled = stdenv.isAarch32;
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
+    src = fetchFromGitHub {
+      owner = "nmoinvaz";
+      repo = pname;
+      rev = version;
+      sha256 = "1a88v1gjlflsd17mlrgxh420rpa38q0d17yh9q8j1zzqfrd1azch";
+    };
+
+    nativeBuildInputs = [ cmake pkgconfig ];
+
+    cmakeFlags = [
+      "-DBUILD_SHARED_LIBS=YES"
+    ];
+
+    buildInputs = [
+      zlib
+      libbsd # required in 2.2.7 but not in 2.9.2?
+    ];
+
+    meta = with stdenv.lib; {
+      description = "Compression library implementing the deflate compression method found in gzip and PKZIP";
+      homepage = "https://github.com/nmoinvaz/minizip";
+      license = licenses.zlib;
+      platforms = platforms.unix;
+    };
+  };
+in
+mkDerivation rec {
+  pname = "linphone-desktop";
+  # Latest release is 4.1.1 old and doesn't build with the latest releases of
+  # some of the dependencies so let's use the latest commit.
+  version = "unstable-2020-03-06";
+
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
     repo = pname;
-    rev = version;
-    sha256 = "0az2ywrpx11sqfb4s4r2v726avcjf4k15bvrqj7xvhz7hdndmh0j";
+    rev = "971997e162558d37051f89c9c34bbc240135f704";
+    sha256 = "02ji4r8bpcm2kyisn9d3054m026l33g2574i1ag1cmb2dz2p8i1c";
   };
 
-  cmakeFlags = stdenv.lib.optional withGui [ "-DENABLE_GTK_UI=ON" ];
+  # Without this patch, the build fails with:
+  #
+  #   No rule to make target
+  #   'minizip_OUTPUT/nix/store/...linphone-desktop.../lib/libminizip.so',
+  #
+  # So, the makefile tries to use a full absolute path to the library but does
+  # it incorrectly. As we have installed Minizip properly, it's sufficient to
+  # just use "minizip" and the library is found automatically. If this patched
+  # target_link_libraries line was removed entirely, the build would fail at the
+  # very end when linking minizip.
+  patches = [
+    ./fix_minizip_linking.patch
+  ];
 
+  # See: https://gitlab.linphone.org/BC/public/linphone-desktop/issues/21
   postPatch = ''
-    touch coreapi/liblinphone_gitversion.h
+    substituteInPlace src/app/AppController.cpp \
+      --replace "LINPHONE_QT_GIT_VERSION" "\"${version}\""
   '';
 
+  # TODO: After linphone-desktop and liblinphone split into separate packages,
+  # there might be some build inputs here that aren't needed for
+  # linphone-desktop.
   buildInputs = [
-    readline openldap cyrus_sasl libupnp zlib libxml2 gtk2 libnotify speex ffmpeg libX11
-    mbedtls libsoup udev ortp mediastreamer sqlite belle-sip libosip libexosip
-    bctoolbox libmatroska gdk-pixbuf glib cairo pango bzrtp belcard bcg729
+    bcg729
+    bctoolbox
+    belcard
+    belle-sip
+    belr
+    bzrtp
+    cairo
+    cyrus_sasl
+    ffmpeg
+    gdk-pixbuf
+    glib
+    gtk2
+    libX11
+    libexosip
+    liblinphone
+    libmatroska
+    libnotify
+    libosip
+    libsoup
+    libupnp
+    libxml2
+    mbedtls
+    mediastreamer
+    mediastreamer-openh264
+    minizip2
+    openldap
+    ortp
+    pango
+    qtbase
+    qtgraphicaleffects
+    qtquickcontrols2
+    qttranslations
+    readline
+    speex
+    sqlite
+    udev
+    zlib
   ];
 
   nativeBuildInputs = [
-    intltool pkgconfig makeWrapper cmake bcunit doxygen graphviz
-    (python.withPackages (ps: [ ps.pystache ps.six ]))
+    bcunit
+    cmake
+    gnused
+    graphviz
+    intltool
+    makeWrapper
+    pkgconfig
   ];
 
-  NIX_CFLAGS_COMPILE = [
-    "-Wno-error"
-    "-I${glib.dev}/include/glib-2.0"
-    "-I${glib.out}/lib/glib-2.0/include"
-    "-I${gtk2.dev}/include/gtk-2.0/"
-    "-I${cairo.dev}/include/cairo"
-    "-I${pango.dev}/include/pango-1.0"
-    "-I${gtk2}/lib/gtk-2.0/include"
-    "-DLIBLINPHONE_GIT_VERSION=\"v${version}\""
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=RelWithDebInfo"
+    "-DMINIZIP_INCLUDE_DIRS=${minizip2}/include"
+    "-DMINIZIP_LIBRARIES=minizip"
   ];
 
-  postInstall = ''
-    for i in $(cd $out/bin && ls); do
-      wrapProgram $out/bin/$i --set MEDIASTREAMER_PLUGINS_DIR ${mediastreamer-openh264}/lib/mediastreamer/plugins
-    done
+  # The default install phase fails because the paths are somehow messed up in
+  # the makefiles. The errors were like:
+  #
+  #   CMake Error at cmake_builder/linphone_package/cmake_install.cmake:49 (file):
+  #     file INSTALL cannot find
+  #     "/build/linphone-desktop-.../build/linphone-sdk/desktop//nix/store/.../bin":
+  #     No such file or directory.
+  #
+  # If someone is able to figure out how to fix that, great. For now, just
+  # trying to pick all the relevant files to the output.
+  #
+  # Also, the exec path in linphone.desktop file remains invalid, pointing to
+  # the build directory, after the whole nix build process. So, let's use sed to
+  # manually fix that path.
+  #
+  # In order to find mediastreamer plugins, mediastreamer package was patched to
+  # support an environment variable pointing to the plugin directory. Set that
+  # environment variable by wrapping the Linphone executable.
+  #
+  # Also, some grammar files needed to be copied too from some dependencies. I
+  # suppose if one define a dependency in such a way that its share directory is
+  # found, then this copying would be unnecessary. These missing grammar files
+  # were discovered when linphone crashed at startup and it was run with
+  # --verbose flag. Instead of actually copying these files, create symlinks.
+  #
+  # It is quite likely that there are some other files still missing and
+  # Linphone will randomly crash when it tries to access those files. Then,
+  # those just need to be copied manually below.
+  installPhase = ''
+    mkdir -p $out/bin
+    cp linphone $out/bin/
+    wrapProgram $out/bin/linphone \
+      --set MEDIASTREAMER_PLUGINS_DIR \
+            ${mediastreamer-openh264}/lib/mediastreamer/plugins
+    mkdir -p $out/share/applications
+    sed -i "s@/build/.*/OUTPUT/bin@$out/bin@" linphone.desktop
+    cp linphone.desktop $out/share/applications/
+    cp -r ../assets/icons $out/share/
+    mkdir -p $out/share/belr/grammars
+    ln -s ${belcard}/share/belr/grammars/* $out/share/belr/grammars/
+    ln -s ${liblinphone}/share/belr/grammars/* $out/share/belr/grammars/
+    mkdir -p $out/share/linphone
+    ln -s ${liblinphone}/share/linphone/* $out/share/linphone/
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = https://www.linphone.org/;
     description = "Open source SIP phone for voice/video calls and instant messaging";
-    license = licenses.gpl2Plus;
+    license = licenses.gpl3;
     platforms = platforms.linux;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/applications/networking/instant-messengers/linphone/fix_minizip_linking.patch b/pkgs/applications/networking/instant-messengers/linphone/fix_minizip_linking.patch
new file mode 100644
index 000000000000..bb88d0030fae
--- /dev/null
+++ b/pkgs/applications/networking/instant-messengers/linphone/fix_minizip_linking.patch
@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 3ee77441..18ea5c27 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -517,7 +517,7 @@ else()
+             target_link_libraries(${TARGET_NAME} "${MINIZIP_OUTPUT_DIR}/${CMAKE_INSTALL_LIBDIR}/libminizip.dylib")
+             execute_process(COMMAND install_name_tool -id "@executable_path/../Frameworks/libminizip.dylib" "${MINIZIP_OUTPUT_DIR}/${CMAKE_INSTALL_LIBDIR}/libminizip.dylib")
+         elseif(NOT WIN32)
+-            target_link_libraries(${TARGET_NAME} "${MINIZIP_OUTPUT_DIR}/${CMAKE_INSTALL_LIBDIR}/libminizip.so")
++            target_link_libraries(${TARGET_NAME} "minizip")
+         endif()
+     endif()#If (LinphoneCxx_FOUND AND Minizip_FOUND)
+ endif()#If (LinphoneCxx_FOUND)
diff --git a/pkgs/development/libraries/bctoolbox/default.nix b/pkgs/development/libraries/bctoolbox/default.nix
index 1c81dd608cbf..22578dad38db 100644
--- a/pkgs/development/libraries/bctoolbox/default.nix
+++ b/pkgs/development/libraries/bctoolbox/default.nix
@@ -1,27 +1,39 @@
-{ stdenv, fetchFromGitHub, cmake, bcunit, mbedtls }:
+{ bcunit
+, cmake
+, fetchFromGitLab
+, mbedtls
+, stdenv
+}:
 
 stdenv.mkDerivation rec {
   pname = "bctoolbox";
-  version = "0.6.0";
+  version = "4.3.1";
 
   nativeBuildInputs = [ cmake bcunit ];
   buildInputs = [ mbedtls ];
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
     repo = pname;
     rev = version;
-    sha256 = "1cxx243wyzkd4xnvpyqf97n0rjhfckpvw1vhwnbwshq3q6fra909";
+    sha256 = "1y91jcrma4kjqpm6w5ahlygjsyvx7l8zjrjvq7g2n39jmw175cvs";
   };
 
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
   NIX_CFLAGS_COMPILE = [ "-Wno-error=stringop-truncation" ];
 
-  meta = {
+  meta = with stdenv.lib; {
     inherit version;
     description = "Utilities library for Linphone";
-    homepage = "https://github.com/BelledonneCommunications/bctoolbox";
-    license = stdenv.lib.licenses.gpl2Plus ;
-    maintainers = [stdenv.lib.maintainers.raskin];
-    platforms = stdenv.lib.platforms.linux;
+    homepage = "https://gitlab.linphone.org/BC/public/bctoolbox";
+    # Still using GPLv2 but as the rest of the Linphone projects have switched
+    # to GPLv3, this might too, so check this when bumping the version number.
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ raskin jluttine ];
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/development/libraries/belcard/default.nix b/pkgs/development/libraries/belcard/default.nix
index aa6cb8513ae4..11de04889159 100644
--- a/pkgs/development/libraries/belcard/default.nix
+++ b/pkgs/development/libraries/belcard/default.nix
@@ -1,24 +1,34 @@
-{ stdenv, cmake, fetchFromGitHub, bctoolbox, belr }:
+{ bctoolbox
+, belr
+, cmake
+, fetchFromGitLab
+, stdenv
+}:
 
 stdenv.mkDerivation rec {
-  baseName = "belcard";
-  version = "1.0.2";
-  name = "${baseName}-${version}";
+  pname = "belcard";
+  version = "4.3.1";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
-    repo = baseName;
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
     rev = version;
-    sha256 = "1pwji83vpsdrfma24rnj3rz1x0a0g6zk3v4xjnip7zf2ys3zcnlk";
+    sha256 = "1w6rbp53cwxr00clp957458x27cgc2y9ylwa5mp812qva7zadmfw";
   };
 
   buildInputs = [ bctoolbox belr ];
   nativeBuildInputs = [ cmake ];
 
-  meta = with stdenv.lib;{
-    description = "Belcard is a C++ library to manipulate VCard standard format";
-    homepage = https://github.com/BelledonneCommunications/belcard;
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
+  meta = with stdenv.lib; {
+    description = "C++ library to manipulate VCard standard format";
+    homepage = "https://gitlab.linphone.org/BC/public/belcard";
     license = licenses.lgpl21;
     platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/belle-sip/default.nix b/pkgs/development/libraries/belle-sip/default.nix
index 0d3df37d8e09..a935372656e7 100644
--- a/pkgs/development/libraries/belle-sip/default.nix
+++ b/pkgs/development/libraries/belle-sip/default.nix
@@ -1,22 +1,36 @@
-{ stdenv, antlr3_4, libantlr3c, jre, mbedtls, fetchFromGitHub
-  , cmake, zlib, bctoolbox
+{ antlr3_4
+, bctoolbox
+, cmake
+, fetchFromGitLab
+, jre
+, libantlr3c
+, mbedtls
+, stdenv
+, zlib
 }:
 
 stdenv.mkDerivation rec {
   pname = "belle-sip";
-  version = "1.6.3";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-02-18";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
     repo = pname;
-    rev = version;
-    sha256 = "0q70db1klvhca1af29bm9paka3gyii5hfbzrj4178gclsg7cj8fk";
+    rev = "0dcb13416eae87edf140771b886aedaf6be8cf60";
+    sha256 = "0pzxk8mkkg6zsnmj1bwggbdjv864psx89gglfm51h8s501kg11fv";
   };
 
   nativeBuildInputs = [ jre cmake ];
 
   buildInputs = [ zlib ];
 
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
   NIX_CFLAGS_COMPILE = toString [
     "-Wno-error=deprecated-declarations"
     "-Wno-error=format-truncation"
@@ -29,9 +43,10 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = false;
 
   meta = with stdenv.lib; {
-    homepage = https://linphone.org/technical-corner/belle-sip;
+    homepage = "https://linphone.org/technical-corner/belle-sip";
     description = "Modern library implementing SIP (RFC 3261) transport, transaction and dialog layers";
-    license = licenses.gpl2;
+    license = licenses.gpl3;
     platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/belr/default.nix b/pkgs/development/libraries/belr/default.nix
index f0557b0379f2..90067e493a15 100644
--- a/pkgs/development/libraries/belr/default.nix
+++ b/pkgs/development/libraries/belr/default.nix
@@ -1,24 +1,35 @@
-{ stdenv, cmake, fetchFromGitHub, bctoolbox }:
+{ bctoolbox
+, cmake
+, fetchFromGitLab
+, stdenv
+}:
 
 stdenv.mkDerivation rec {
-  baseName = "belr";
-  version = "0.1.3";
-  name = "${baseName}-${version}";
+  pname = "belr";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-03-09";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
-    repo = baseName;
-    rev = version;
-    sha256 = "0mf8lsyq1z3b5p47c00lnwc8n7v9nzs1fd2g9c9hnz6fjd2ka44w";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
+    rev = "326d030ca9db12525c2a6d2a65f386f36f3c2ed5";
+    sha256 = "1cdblb9smncq3al0crqp5651b02k1g6whlw1ib769p61gad0rs3v";
   };
 
   buildInputs = [ bctoolbox ];
   nativeBuildInputs = [ cmake ];
 
-  meta = with stdenv.lib;{
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
+  meta = with stdenv.lib; {
     description = "Belr is Belledonne Communications' language recognition library";
-    homepage = https://github.com/BelledonneCommunications/belr;
-    license = licenses.lgpl21;
+    homepage = "https://gitlab.linphone.org/BC/public/belr";
+    license = licenses.gpl3;
     platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/bzrtp/default.nix b/pkgs/development/libraries/bzrtp/default.nix
index b2dc295db5b7..2eb5a2dfcffb 100644
--- a/pkgs/development/libraries/bzrtp/default.nix
+++ b/pkgs/development/libraries/bzrtp/default.nix
@@ -1,26 +1,38 @@
-{ stdenv, cmake, fetchFromGitHub, bctoolbox, sqlite }:
+{ bctoolbox
+, cmake
+, fetchFromGitLab
+, sqlite
+, stdenv
+}:
 
 stdenv.mkDerivation rec {
-  baseName = "bzrtp";
-  version = "1.0.6";
-  name = "${baseName}-${version}";
+  pname = "bzrtp";
+  version = "4.3.1";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
-    repo = baseName;
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
     rev = version;
-    sha256 = "0438zzxp82bj5fmvqnwlljkgrz9ab5qm5lgpwwgmg1cp78bp2l45";
+    sha256 = "14fqp6r9rf7z6j5phbsrdxlbjak03hs8kb94b6jgcrcdxrxhy3fy";
   };
 
   buildInputs = [ bctoolbox sqlite ];
   nativeBuildInputs = [ cmake ];
 
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
   NIX_CFLAGS_COMPILE = "-Wno-error=cast-function-type";
 
   meta = with stdenv.lib; {
     description = "BZRTP is an opensource implementation of ZRTP keys exchange protocol";
-    homepage = https://github.com/BelledonneCommunications/bzrtp;
+    homepage = "https://gitlab.linphone.org/BC/public/bzrtp";
+    # They have switched to GPLv3 on git HEAD so probably the next release will
+    # be GPL3.
     license = licenses.lgpl21;
     platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/liblinphone/default.nix b/pkgs/development/libraries/liblinphone/default.nix
new file mode 100644
index 000000000000..c6628e9043cd
--- /dev/null
+++ b/pkgs/development/libraries/liblinphone/default.nix
@@ -0,0 +1,150 @@
+{ bcg729
+, bctoolbox
+, bcunit
+, belcard
+, belle-sip
+, belr
+, bzrtp
+, cairo
+, cmake
+, cyrus_sasl
+, doxygen
+, fetchFromGitLab
+, fetchurl
+, ffmpeg
+, gdk-pixbuf
+, git
+, glib
+, graphviz
+, gtk2
+, intltool
+, libexosip
+, libmatroska
+, libnotify
+, libosip
+, libsoup
+, libupnp
+, libX11
+, libxml2
+, lime
+, makeWrapper
+, mbedtls
+, mediastreamer
+, mediastreamer-openh264
+, openldap
+, ortp
+, pango
+, pkgconfig
+, python
+, readline
+, soci
+, speex
+, sqlite
+, stdenv
+, udev
+, xercesc
+, xsd
+, zlib
+}:
+let
+  # Got the following error when building:
+  #
+  #   Your version of Doxygen (1.8.17) is known to malfunction with some of our
+  #   macro definitions, which causes errors while wrapprers generation. Please
+  #   install an older version of Doxygen (< 1.8.17) or disable documentation
+  #   and wrapper generation.
+  #
+  # So, let's then use 1.8.16 version of doxygen in this derivation. Hopefully
+  # this workaround can be removed with some newer release of liblinphone.
+  doxygen_1_8_16 = doxygen.overrideAttrs (
+    oldAttrs: rec {
+      name = "doxygen-1.8.16";
+      src = fetchurl {
+        urls = [
+          "mirror://sourceforge/doxygen/${name}.src.tar.gz" # faster, with https, etc.
+          "http://doxygen.nl/files/${name}.src.tar.gz"
+        ];
+        sha256 = "10iwv8bcz5b5cd85gg8pgn0bmyg04n9hs36xn7ggjjnvynv1z67z";
+      };
+      buildInputs = oldAttrs.buildInputs ++ [ git ];
+    }
+  );
+in
+stdenv.mkDerivation rec {
+  pname = "liblinphone";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-03-20";
+
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
+    rev = "1d762a3e0e304aa579798aed4400d2cee2c1ffa0";
+    sha256 = "0ja38payyqbd8z6q5l5w6hi7xarmfj5021gh0qdk0j832br4c6c3";
+  };
+
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
+  # TODO: Not sure if all these inputs are actually needed. Most of them were
+  # defined when liblinphone and linphone-desktop weren't separated yet, so some
+  # of them might not be needed for liblinphone alone.
+  buildInputs = [
+    (python.withPackages (ps: [ ps.pystache ps.six ]))
+    bcg729
+    bctoolbox
+    belcard
+    belle-sip
+    belr
+    bzrtp
+    cairo
+    cyrus_sasl
+    ffmpeg
+    gdk-pixbuf
+    git
+    glib
+    gtk2
+    libX11
+    libexosip
+    libmatroska
+    libnotify
+    libosip
+    libsoup
+    libupnp
+    libxml2
+    lime
+    mbedtls
+    mediastreamer
+    openldap
+    ortp
+    pango
+    readline
+    soci
+    speex
+    sqlite
+    udev
+    xercesc
+    xsd
+    zlib
+  ];
+
+  nativeBuildInputs = [
+    bcunit
+    cmake
+    doxygen_1_8_16
+    graphviz
+    intltool
+    makeWrapper
+    pkgconfig
+  ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://www.linphone.org/technical-corner/liblinphone";
+    description = "Library for SIP calls and instant messaging";
+    license = licenses.gpl3;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ jluttine ];
+  };
+}
diff --git a/pkgs/development/libraries/lime/default.nix b/pkgs/development/libraries/lime/default.nix
new file mode 100644
index 000000000000..3ebcc7ad78a6
--- /dev/null
+++ b/pkgs/development/libraries/lime/default.nix
@@ -0,0 +1,36 @@
+{ bctoolbox
+, belle-sip
+, cmake
+, fetchFromGitLab
+, soci
+, sqlite
+, stdenv
+}:
+
+stdenv.mkDerivation rec {
+  pname = "lime";
+  version = "4.3.1";
+
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
+    rev = version;
+    sha256 = "1ilpp9ai4sah23ngnxisvmwhrv5jkk5f831yp7smpl225z5nv83g";
+  };
+
+  buildInputs = [ bctoolbox soci belle-sip sqlite ];
+  nativeBuildInputs = [ cmake ];
+
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
+  meta = with stdenv.lib; {
+    description = "End-to-end encryption library for instant messaging";
+    homepage = "http://www.linphone.org/technical-corner/lime";
+    license = licenses.gpl3;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
+  };
+}
diff --git a/pkgs/development/libraries/mediastreamer/default.nix b/pkgs/development/libraries/mediastreamer/default.nix
index 0204223d127c..5f7daa83b2f5 100644
--- a/pkgs/development/libraries/mediastreamer/default.nix
+++ b/pkgs/development/libraries/mediastreamer/default.nix
@@ -1,37 +1,97 @@
-{ stdenv, pkgconfig, intltool, alsaLib, libpulseaudio, speex, gsm
-, libopus, ffmpeg, libX11, libXv, libGLU, libGL, glew, libtheora, libvpx, SDL, libupnp
-, ortp, libv4l, libpcap, srtp, fetchFromGitHub, cmake, bctoolbox, doxygen
-, python, libXext, libmatroska, fetchpatch
+{ alsaLib
+, bctoolbox
+, bzrtp
+, cmake
+, doxygen
+, fetchFromGitLab
+, fetchpatch
+, ffmpeg
+, glew
+, gsm
+, intltool
+, libGL
+, libGLU
+, libX11
+, libXext
+, libXv
+, libmatroska
+, libopus
+, libpcap
+, libpulseaudio
+, libtheora
+, libupnp
+, libv4l
+, libvpx
+, ortp
+, pkgconfig
+, python
+, SDL
+, speex
+, srtp
+, stdenv
 }:
 
 stdenv.mkDerivation rec {
   pname = "mediastreamer2";
-  version = "2.16.1";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-03-20";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
     repo = pname;
-    rev = version;
-    sha256 = "02745bzl2r1jqvdqzyv94fjd4w92zr976la4c4nfvsy52waqah7j";
+    rev = "c5eecb72cb44376d142949051dd0cb7c982608fb";
+    sha256 = "1vp260jxvjlmrmjdl4p23prg4cjln20a7z6zq8dqvfh4iq3ya033";
   };
 
   patches = [
-    (fetchpatch {
-      name = "allow-build-without-git.patch";
-      url = "https://github.com/BelledonneCommunications/mediastreamer2/commit/de3a24b795d7a78e78eab6b974e7ec5abf2259ac.patch";
-      sha256 = "1zqkrab42n4dha0knfsyj4q0wc229ma125gk9grj67ps7r7ipscy";
-    })
+    # Plugins directory is normally fixed during compile time. This patch makes
+    # it possible to set the plugins directory run time with an environment
+    # variable MEDIASTREAMER_PLUGINS_DIR. This makes it possible to construct a
+    # plugin directory with desired plugins and wrap executables so that the
+    # environment variable points to that directory.
     ./plugins_dir.patch
   ];
 
-  nativeBuildInputs = [ pkgconfig intltool cmake doxygen python ];
+  nativeBuildInputs = [
+    cmake
+    doxygen
+    intltool
+    pkgconfig
+    python
+  ];
 
   propagatedBuildInputs = [
-    alsaLib libpulseaudio speex gsm libopus
-    ffmpeg libX11 libXv libGLU libGL glew libtheora libvpx SDL libupnp
-    ortp libv4l libpcap srtp bctoolbox libXext libmatroska
+    alsaLib
+    bctoolbox
+    bzrtp
+    ffmpeg
+    glew
+    gsm
+    libGL
+    libGLU
+    libX11
+    libXext
+    libXv
+    libmatroska
+    libopus
+    libpcap
+    libpulseaudio
+    libtheora
+    libupnp
+    libv4l
+    libvpx
+    ortp
+    SDL
+    speex
+    srtp
   ];
 
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
   NIX_CFLAGS_COMPILE = toString [
     "-DGIT_VERSION=\"v${version}\""
     "-Wno-error=deprecated-declarations"
@@ -43,8 +103,9 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A powerful and lightweight streaming engine specialized for voice/video telephony applications";
-    homepage = http://www.linphone.org/technical-corner/mediastreamer2;
-    license = licenses.gpl2;
+    homepage = "http://www.linphone.org/technical-corner/mediastreamer2";
+    license = licenses.gpl3;
     platforms = platforms.linux;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/mediastreamer/msopenh264.nix b/pkgs/development/libraries/mediastreamer/msopenh264.nix
index f1e9fc301510..45b3c83bfe24 100644
--- a/pkgs/development/libraries/mediastreamer/msopenh264.nix
+++ b/pkgs/development/libraries/mediastreamer/msopenh264.nix
@@ -1,31 +1,49 @@
-{ stdenv, autoreconfHook, pkgconfig, mediastreamer, openh264
-, fetchurl, fetchpatch, cmake
+{ autoreconfHook
+, cmake
+, fetchFromGitLab
+, fetchpatch
+, mediastreamer
+, openh264
+, pkgconfig
+, stdenv
 }:
 
 stdenv.mkDerivation rec {
-  pname = "mediastreamer-openh264";
-  version = "1.2.1";
+  pname = "msopenh264";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-03-03";
 
-  src = fetchurl {
-    url = "https://www.linphone.org/releases/sources/plugins/msopenh264/msopenh264-${version}.tar.gz";
-    sha256 = "0rdxgazm52560g52pp6mp3mwx6j1z3h2zyizzfycp8y8zi92fqm8";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
+    rev = "2c3abf52824ad23a4caae7565ef158ef91767704";
+    sha256 = "140hs5lzpshzswvl39klcypankq3v2qck41696j22my7s4wsa0hr";
   };
 
-  patches = [
-    (fetchpatch {
-      name = "msopenh264-build-with-openh264-v2.patch";
-      url = "https://git.pld-linux.org/?p=packages/mediastreamer-plugin-msopenh264.git;a=blob_plain;f=mediastreamer-plugin-msopenh264-openh264.patch;hb=344b8af379701a7e58b4ffb3cbac1517eff079fd";
-      sha256 = "10c24b0afchx78q28176pd8iz7i1nlf57f6v6lyqxpz60fm5nrcc";
-    })
-  ];
-
   nativeBuildInputs = [ autoreconfHook cmake pkgconfig ];
   buildInputs = [ mediastreamer openh264 ];
 
+  # Do not build static libraries
+  cmakeFlags = [
+    "-DENABLE_STATIC=NO"
+    "-DCMAKE_SKIP_INSTALL_RPATH=ON"
+  ];
+
+  # CMAKE_INSTALL_PREFIX has no effect so let's install manually. See:
+  # https://gitlab.linphone.org/BC/public/msopenh264/issues/1
+  installPhase = ''
+    mkdir -p $out/lib/mediastreamer/plugins
+    cp src/libmsopenh264.so $out/lib/mediastreamer/plugins/
+  '';
+
   meta = with stdenv.lib; {
     description = "H.264 encoder/decoder plugin for mediastreamer2";
     homepage = "https://www.linphone.org/technical-corner/mediastreamer2";
     license = licenses.gpl2;
     platforms = platforms.linux;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/mediastreamer/plugins_dir.patch b/pkgs/development/libraries/mediastreamer/plugins_dir.patch
index e64bfc5a43a1..43e398aafee4 100644
--- a/pkgs/development/libraries/mediastreamer/plugins_dir.patch
+++ b/pkgs/development/libraries/mediastreamer/plugins_dir.patch
@@ -1,24 +1,18 @@
-diff -uNr mediastreamer2/src/base/msfactory.c mediastreamer2-new/src/base/msfactory.c
---- a/src/base/msfactory.c	2015-05-13 16:53:49.801113249 +0200
-+++ b/src/base/msfactory.c	2015-08-26 21:35:44.994724647 +0200
-@@ -630,12 +630,18 @@
+diff --git a/src/base/msfactory.c b/src/base/msfactory.c
+index 14f868e3..2e3445a1 100644
+--- a/src/base/msfactory.c
++++ b/src/base/msfactory.c
+@@ -770,7 +770,12 @@ void ms_factory_uninit_plugins(MSFactory *factory){
  }
  
  void ms_factory_init_plugins(MSFactory *obj) {
+-	if (obj->plugins_dir == NULL) {
 +	char *package_plugins_dir;
- 	if (obj->plugins_dir == NULL) {
-+		package_plugins_dir=getenv("MEDIASTREAMER_PLUGINS_DIR");
-+		if (package_plugins_dir!=NULL){
-+			obj->plugins_dir = ms_strdup(package_plugins_dir);
-+		} else {
- #ifdef PACKAGE_PLUGINS_DIR
--		obj->plugins_dir = ms_strdup(PACKAGE_PLUGINS_DIR);
-+			obj->plugins_dir = ms_strdup(PACKAGE_PLUGINS_DIR);
- #else
--		obj->plugins_dir = ms_strdup("");
-+			obj->plugins_dir = ms_strdup("");
- #endif
-+		}
- 	}
- 	if (strlen(obj->plugins_dir) > 0) {
- 		ms_message("Loading ms plugins from [%s]",obj->plugins_dir);
++	// Force plugin dir from environment variable if set
++	package_plugins_dir = getenv("MEDIASTREAMER_PLUGINS_DIR");
++	if (package_plugins_dir != NULL) {
++		ms_factory_set_plugins_dir(obj, package_plugins_dir);
++	} else if (obj->plugins_dir == NULL) {
+ #ifdef __APPLE__
+ 	char *dir = getPluginsDir();
+ 	if (dir != NULL) {
diff --git a/pkgs/development/libraries/ortp/default.nix b/pkgs/development/libraries/ortp/default.nix
index 68e890e33682..53636f05b789 100644
--- a/pkgs/development/libraries/ortp/default.nix
+++ b/pkgs/development/libraries/ortp/default.nix
@@ -1,16 +1,27 @@
-{ stdenv, cmake, fetchFromGitHub, bctoolbox }:
+{ bctoolbox
+, cmake
+, fetchFromGitLab
+, stdenv
+}:
 
 stdenv.mkDerivation rec {
   pname = "ortp";
-  version = "1.0.2";
+  # Using master branch for linphone-desktop caused a chain reaction that many
+  # of its dependencies needed to use master branch too.
+  version = "unstable-2020-03-17";
 
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
     repo = pname;
-    rev = version;
-    sha256 = "12cwv593bsdnxs0zfcp07vwyk7ghlz2wv7vdbs1ksv293w3vj2rv";
+    rev = "804dfc4f90d1a4301127c7af10a74fd2935dd5d8";
+    sha256 = "1yr8j8am68spyy5d9vna8zcq3qn039mi16cv9jf5n4chs9rxf7xx";
   };
 
+  # Do not build static libraries
+  cmakeFlags = [ "-DENABLE_STATIC=NO" ];
+
   NIX_CFLAGS_COMPILE = "-Wno-error=stringop-truncation";
 
   buildInputs = [ bctoolbox ];
@@ -18,8 +29,9 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A Real-Time Transport Protocol (RFC3550) stack";
-    homepage = https://linphone.org/technical-corner/ortp;
-    license = licenses.gpl2Plus;
+    homepage = "https://linphone.org/technical-corner/ortp";
+    license = licenses.gpl3;
     platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
   };
 }
diff --git a/pkgs/development/libraries/soci/default.nix b/pkgs/development/libraries/soci/default.nix
new file mode 100644
index 000000000000..1f9b77cc3c92
--- /dev/null
+++ b/pkgs/development/libraries/soci/default.nix
@@ -0,0 +1,31 @@
+{ cmake
+, fetchFromGitHub
+, sqlite
+, stdenv
+}:
+
+stdenv.mkDerivation rec {
+  pname = "soci";
+  version = "4.0.0";
+
+  src = fetchFromGitHub {
+    owner = "SOCI";
+    repo = pname;
+    rev = version;
+    sha256 = "06faswdxd2frqr9xnx6bxc7zwarlzsbdi3bqpz7kwdxsjvq41rnb";
+  };
+
+  # Do not build static libraries
+  cmakeFlags = [ "-DSOCI_STATIC=OFF" ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ sqlite ];
+
+  meta = with stdenv.lib; {
+    description = "Database access library for C++";
+    homepage = "http://soci.sourceforge.net/";
+    license = licenses.boost;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine ];
+  };
+}
diff --git a/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch b/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch
new file mode 100644
index 000000000000..1854a43a2493
--- /dev/null
+++ b/pkgs/tools/audio/trx/add_bctoolbox_ldlib.patch
@@ -0,0 +1,15 @@
+diff --git a/Makefile b/Makefile
+index ffcd883..c4b4ff7 100644
+--- a/Makefile
++++ b/Makefile
+@@ -12,8 +12,9 @@ CFLAGS += -MMD -Wall
+ LDLIBS_ASOUND ?= -lasound
+ LDLIBS_OPUS ?= -lopus
+ LDLIBS_ORTP ?= -lortp
++LDLIBS_BCTOOLBOX ?= -lbctoolbox
+ 
+-LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP)
++LDLIBS += $(LDLIBS_ASOUND) $(LDLIBS_OPUS) $(LDLIBS_ORTP) $(LDLIBS_BCTOOLBOX)
+ 
+ .PHONY:		all install dist clean
+ 
diff --git a/pkgs/tools/audio/trx/default.nix b/pkgs/tools/audio/trx/default.nix
index 1d052adbba9f..224c331b9610 100644
--- a/pkgs/tools/audio/trx/default.nix
+++ b/pkgs/tools/audio/trx/default.nix
@@ -2,13 +2,19 @@
 
 stdenv.mkDerivation rec {
   pname = "trx";
-  version = "0.4";
+  version = "0.5";
 
   src = fetchurl {
     url = "https://www.pogo.org.uk/~mark/trx/releases/${pname}-${version}.tar.gz";
-    sha256 = "1wsrkbqc090px8i9p8awz38znxjcqjb1dzjjdd8xkjmiprayjhkl";
+    sha256 = "1jjgca92nifjhcr3n0fmpfr6f5gxlqyal2wmgdlgd7hx834r1if7";
   };
 
+  # Makefile is currently missing -lbctoolbox so the build fails when linking
+  # the libraries. This patch adds that flag.
+  patches = [
+    ./add_bctoolbox_ldlib.patch
+  ];
+
   buildInputs = [ alsaLib libopus ortp bctoolbox ];
   makeFlags = [ "PREFIX=$(out)" ];
 
diff --git a/pkgs/tools/misc/bcunit/default.nix b/pkgs/tools/misc/bcunit/default.nix
index 4a440e133feb..203735d79b0b 100644
--- a/pkgs/tools/misc/bcunit/default.nix
+++ b/pkgs/tools/misc/bcunit/default.nix
@@ -1,22 +1,30 @@
-{stdenv, fetchFromGitHub, cmake}:
+{ cmake
+, fetchFromGitLab
+, stdenv
+}:
+
 stdenv.mkDerivation rec {
-  name = "${baseName}-${version}";
-  baseName = "bcunit";
-  version = "3.0.2";
-  buildInputs = [cmake];
-  src = fetchFromGitHub {
-    owner = "BelledonneCommunications";
-    repo = baseName;
-    rev = version;
-    sha256 = "063yl7kxkix76r49qrj0h1qpz2p538d1yw8aih0x4i47g35k00y7";
+  pname = "bcunit";
+  # Latest release 3.0.2 is missing some functions needed by bctoolbox. See:
+  # https://gitlab.linphone.org/BC/public/bcunit/issues/1
+  version = "unstable-2019-11-19";
+
+  buildInputs = [ cmake ];
+  src = fetchFromGitLab {
+    domain = "gitlab.linphone.org";
+    owner = "public";
+    group = "BC";
+    repo = pname;
+    rev = "3c720fbf67dd3c02b0c7011ed4036982b2c93532";
+    sha256 = "1237hpmkls2igp60gdfkbknxpgwvxn1vmv2m41vyl25xw1d3g35w";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     inherit version;
-    description = ''A fork of CUnit test framework'';
-    license = stdenv.lib.licenses.lgpl2Plus;
-    maintainers = [stdenv.lib.maintainers.raskin];
-    platforms = stdenv.lib.platforms.linux;
+    description = "A fork of CUnit test framework";
+    homepage = "https://gitlab.linphone.org/BC/public/bcunit";
+    license = licenses.lgpl2Plus;
+    maintainers = with maintainers; [ raskin jluttine ];
+    platforms = platforms.linux;
   };
 }
-
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 298bd1cf5f99..43786337ed5f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20342,9 +20342,11 @@ in
 
   libdsk = callPackage ../misc/emulators/libdsk { };
 
+  liblinphone = callPackage ../development/libraries/liblinphone { };
+
   links2 = callPackage ../applications/networking/browsers/links2 { };
 
-  linphone = callPackage ../applications/networking/instant-messengers/linphone { };
+  linphone = libsForQt5.callPackage ../applications/networking/instant-messengers/linphone { };
 
   linuxsampler = callPackage ../applications/audio/linuxsampler { };
 
@@ -20385,6 +20387,8 @@ in
     flavour = "git";
   };
 
+  lime = callPackage ../development/libraries/lime { };
+
   luakit = callPackage ../applications/networking/browsers/luakit {
     inherit (luajitPackages) luafilesystem;
   };
@@ -21783,6 +21787,8 @@ in
 
   skanlite = libsForQt5.callPackage ../applications/office/skanlite { };
 
+  soci = callPackage ../development/libraries/soci { };
+
   sonic-lineup = libsForQt5.callPackage ../applications/audio/sonic-lineup { };
 
   sonic-visualiser = libsForQt5.callPackage ../applications/audio/sonic-visualiser { };