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+SRTP Protocol
+=============
+
+This document describe the VPP SRTP (Secure Real-time Transport
+Protocol) implementation libsrtp2 based SRTP transport protocol
+implementation.
+
+Maturity level
+--------------
+
+Experimental
+
+Quickstart
+----------
+
+1. Install libsrtp2-dev. On debian based OS:
+
+::
+
+   sudo apt get install libsrtp2-dev
+
+2. Build vpp
+
+::
+
+   make build
+
+3. Test protocol using vcl test server and client. On server side, start
+   vpp and server app:
+
+::
+
+   export VT_PATH=$WS/build-root/build-vpp_debug-native/vpp/bin
+   $VT_PATH/vcl_test_server 1234 -p srtp
+
+On client side:
+
+::
+
+   export VT_PATH=$WS/build-root/build-vpp_debug-native/vpp/bin
+   $VT_PATH/vcl_test_client <server-ip> 1234 -U -X -S -N 10000 -T 128 -p srtp
+
+Custom libsrtp2 build
+---------------------
+
+1. Create ``build/external/packages/srtp.mk`` with following example
+   contents:
+
+::
+
+   srtp_version := 2.3.0
+   srtp_tarball := srtp_$(srtp_version).tar.gz
+   srtp_tarball_md5sum := da38ee5d9c31be212a12964c22d7f795
+   srtp_tarball_strip_dirs := 1
+   srtp_url := https://github.com/cisco/libsrtp/archive/v$(srtp_version).tar.gz
+
+   define  srtp_build_cmds
+       @cd $(srtp_build_dir) && \
+           $(CMAKE) -DCMAKE_INSTALL_PREFIX:PATH=$(srtp_install_dir)    \
+           -DCMAKE_C_FLAGS='-fPIC -fvisibility=hidden'  $(srtp_src_dir) > $(srtp_build_log)
+       @$(MAKE) $(MAKE_ARGS) -C $(srtp_build_dir) > $(srtp_build_log)
+   endef
+
+   define  srtp_config_cmds
+       @true
+   endef
+
+   define  srtp_install_cmds
+       @$(MAKE) $(MAKE_ARGS) -C $(srtp_build_dir) install > $(srtp_install_log)
+   endef
+
+
+   $(eval $(call package,srtp))
+
+2. Include ``srtp.mk`` in ``build/external/Makefile`` and add to install
+   target.
+
+3. Rebuild external dependencies:
+
+::
+
+   make install-ext-deps