Transcoding Using Kamailio and Rtpengine

Transcoding of audio and video codec is complex and costly it is fulfilled with the giant legacy telecom company. Please follow the below example if you want to transcode using opensource and free of cost.

Step 1 - Launch a VM with ubuntu 18.04

Step 2 - Login and Run below command

#apt update && apt-get install -y debhelper=12.1.1ubuntu1~ubuntu18.04.1 dh-autoreconf libmysqlclient-dev iptables-dev libavcodec-dev libavfilter-dev libavformat-dev libavutil-dev libcurl4-openssl-dev libevent-dev libglib2.0-dev libhiredis-dev libjson-glib-dev libpcap-dev libpcre3-dev libsystemd-dev libssl-dev libswresample-dev libxmlrpc-core-c3-dev markdown gperf libbencode-perl libdigest-crc-perl  libcrypt-openssl-rsa-perl       libcrypt-rijndael-perl  libdigest-hmac-perl libio-multiplex-perl  libio-socket-inet6-perl libnet-interface-perl libsocket6-perl default-libmysqlclient-dev libiptc-dev libspandsp-dev libhiredis-dev libjson-glib-dev libpcap0.8-dev libpcre3-dev libssl-dev libswresample-dev libsystemd-dev  git gcc g++ flex bison libmysqlclient-dev make autoconf libssl-dev libcurl4-openssl-dev libxml2-dev libpcre3-dev libxmlrpc-core-c3-dev zlib1g-dev fakeroot unzip redis-server init-system-helpers sngrep wget libconfig-tiny-perl dkms module-assistant nfs-common keyutils libnfsidmap2 libtirpc1 nfs-common rpcbind keyutils libnfsidmap2 libtirpc1 nfs-common rpcbind watchdog

Step 3 - Install Kamailio

#cd /usr/local/src && git clone --depth 1 --no-single-branch https://github.com/kamailio/kamailio kamailio

#cd kamailio && git checkout -b 5.3 origin/5.3

#make include_modules="db_mysql dialplan" cfg

#make PREFIX="/usr/local/kamailio-5.3" include_modules="db_mysql dialplan" cfg

#make all

Step 4: Install RTPEngine with G729 supports

#cd /usr/local/src && git clone https://github.com/sipwise/rtpengine.git
#cd rtpengine && git checkout mr8.2.1.1
#cd /usr/local/src  
VER=1.0.4 && curl   https://codeload.github.com/BelledonneCommunications/bcg729/tar.gz/$VER   >bcg729_$VER.orig.tar.gz
#tar zxf bcg729_$VER.orig.tar.gz && cd bcg729-$VER
#git clone https://github.com/ossobv/bcg729-deb.git debian
#dpkg-buildpackage -us -uc -sa
#cd ..
#dpkg -i libbcg729-0_1.0.4-0osso3+deb9_amd64.deb
#dpkg -i libbcg729-dev_1.0.4-0osso3+deb9_amd64.deb
#dpkg -i libbcg729-0-dbg_1.0.4-0osso3+deb9_amd64.deb
#cd rtpengine/
#dpkg-checkbuilddeps 
#dpkg-buildpackage -rfakeroot
#cd ..
#apt-get -f install && apt --fix-broken install
#dpkg -i ngcp-rtpengine-daemon_8.2.1.1+0~mr8.2.1.1_amd64.deb
#dpkg -i ngcp-rtpengine-iptables_8.2.1.1+0~mr8.2.1.1_amd64.deb
#dpkg -i ngcp-rtpengine-kernel-dkms_8.2.1.1+0~mr8.2.1.1_all.deb
#dpkg -i ngcp-rtpengine-kernel-source_8.2.1.1+0~mr8.2.1.1_all.deb
#dpkg -i ngcp-rtpengine-recording-daemon_8.2.1.1+0~mr8.2.1.1_amd64.deb
#dpkg --install ngcp-rtpengine-utils_8.2.1.1+0~mr8.2.1.1_all.deb
#dpkg -i ngcp-rtpengine_8.2.1.1+0~mr8.2.1.1_all.deb
#dpkg -i ngcp-rtpengine-kernel-source_8.2.1.1+0~mr8.2.1.1_all.deb
#dpkg -i ngcp-rtpengine-daemon-dbgsym_8.2.1.1+0~mr8.2.1.1_amd64.ddeb

# rtpengine --codecs

                PCMA: fully supported

                PCMU: fully supported

                G723: fully supported

                G722: fully supported

               QCELP: supported for decoding only

                G729: fully supported

               speex: fully supported

                 GSM: fully supported

                iLBC: not supported

                opus: fully supported

              vorbis: fully supported

                 ac3: fully supported

                eac3: fully supported

              ATRAC3: supported for decoding only

             ATRAC-X: supported for decoding only

                EVRC: supported for decoding only

               EVRC0: supported for decoding only

               EVRC1: supported for decoding only

                 AMR: supported for decoding only

              AMR-WB: supported for decoding only

           PCM-S16LE: fully supported

                 MP3: fully supported

Step 5: Modify Kamailio configuration

...if (is_method("INVITE")) {
  if (has_body("application/sdp")) {
    rtpengine_manage("codec-mask-all codec-transcode-PCMA");
...

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