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![MEDIA PLAYER
rtpengine
event_route[xhttp:request] {
play_media(“call-id=$var(callid)
from-tag=$var(fromtag)
file=/path/to/hello.mp3”);
}
rtpengine
--interface=ext/1.2.3.4
--listen-ng=127.0.0.1:12221
Kamailio Config rtpengine](https://image.slidesharecdn.com/kw7-rtpengine-agranig-190509090004/75/rtpengine-Media-Relaying-and-Beyond-17-2048.jpg)
rtpengine - Media Relaying and Beyond
- 1. rtpengine Media Relaying andBeyond Andreas Granig <agranig@sipwise.com>
- 2. WHAT IS IT? rtpengine MediaRelay WebRTC Bridge Call Recorder Media Transcoder Media Player
- 3. MEDIA RELAY rtpengine ● Kernelbased forwarding ● Network bridging (IPv4, IPv6) ● IP load balancing (more ports) ● State syncing (Redis)
- 4. MEDIA RELAY rtpengine rtpengine.so modulein Kamailio rtpengine daemon xt_RTPENGINE kernel module rtpengine Kamailio SIP RTP original SDP + meta info modified SDP + meta info
- 5. MEDIA RELAY rtpengine route { ... rtpengine_manage(); ... } rtpengine --interface=ext/1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 6. WEBRTC BRIDGE rtpengine ● SDPprofile transforming ○ RTP/AVP ⬌ RTP/SAVPF ● In-Kernel DTLS-SRTP crypto ● ICE negotiation ● RTCP multiplexing
- 7. WEBRTC BRIDGE rtpengine rtpengine Kamailio SIP RTP original SDP+ meta info modified SDP: ● changed profile ● added ICE candidates ● RTCP mux DTLS-RTP
- 8. WEBRTC BRIDGE rtpengine route { rtpengine_offer(“RTP/SAVPFICE=force”); } reply_route { rtpengine_answer(“RTP/AVP ICE=remove rtcp-mux-demux”); } rtpengine --interface=ext/1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 9. CALL RECORDER rtpengine ● Started/stoppedbefore or during call ● Packet forking to /proc in real-time ● Storing streams as WAV/MP3 on NFS ● Storing meta-data in MySQL
- 10. CALL RECORDER rtpengine rtpengine Kamailio SIP RTP original SDP+ meta info recorder metainfo /var/spool/recordings/ /proc/rtpengine/0/calls/ out.wav /nfs/recordings/Packet Queue modified SDP + meta info
- 11. CALL RECORDER rtpengine route { rtpengine_manage(“record-call metadata=uuid:$var(aid)| uuid:$var(bid)”); } rtpengine --interface=ext/1.2.3.4 --listen-ng=127.0.0.1:12221 --recording-method=proc --recording-dir=/var/spool/rtpengine Kamailio Config rtpengine
- 12. MEDIA TRANSCODER rtpengine ● Transcodingaudio streams ● Supporting Opus, G711, G729, G722, speex, … (see rtpengine --codecs) ● Operating in user-space ● Allowing last-resort and forced mode
- 13. MEDIA TRANSCODER rtpengine rtpengine Kamailio SIP RTP G711 originalSDP + meta info modified SDP: ● filter unwanted codecs ● add additional codecs RTP Opus
- 14. MEDIA TRANSCODER rtpengine route { rtpengine_manage(“mask-all transcode-opus”); } rtpengine --interface=ext/1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 15. MEDIA PLAYER rtpengine ● Injectingaudio into streams ● Playing from local files or MySQL blobs
- 16. MEDIA PLAYER rtpengine rtpengine Kamailio SIP RTP ● call-idof existing call ● from-tag/address ● file/db-id ● calculated duration in.wav
- 17. MEDIA PLAYER rtpengine event_route[xhttp:request] { play_media(“call-id=$var(callid) from-tag=$var(fromtag) file=/path/to/hello.mp3”); } rtpengine --interface=ext/1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 18. MORE FEATURES rtpengine ● DTMFlogging ● Media and DTMF blocking/unblocking ○ block/unblock_dtmf(...) ○ block/unblock_media(...) ● Stream forwarding to 3rd party via TLS (for example to speech recognition engine) ○ start/stop_forwarding(...) ● MOS reporting via AVPs ○ mos_xxx_pv mod-param
- 19.