rtpengine and kamailio - or how to simulate calls at scale
- 1. rtpengine & kamailio or how to simulate calls at scale Andreas Granig <agranig@sipfront.com>
- 2. AT THE NETWORK EDGE rtpengine & kamailio Load Testing Architecture RTP Sinkhole NAT Piercing RTP Echo RTP PubSub
- 3. LOAD TESTING ARCHITECTURE rtpengine & kamailio ● Context ○ At sipfront.com, we develop a SaaS for Telco Test Automation ● Load testing is resource intensive ○ sipp for signaling ○ tcpreplay for media ● kamailio & rtpengine to the rescue ○ protocol conversion for signaling ○ reflection & termination for media
- 4. LOAD TESTING ARCHITECTURE rtpengine & kamailio tcpreplay + RTP patch 1 sipp SIP RTP kamailio rtpengine sinkhole kamailio sipp rtpengine pierce-nat + echo system under test SDP info ctrl ctrl NAT NAT 1 https://github.com/agranig/tcpreplay/tree/agranig/sipfront-rtp-edit
- 5. RTP SINKHOLE rtpengine & kamailio ● Sometimes, you just don’t wanna talk… ○ but want to keep track of stats ○ and want to avoid ICMP port unreachable messages
- 6. RTP SINKHOLE rtpengine & kamailio rtpengine kamailio SIP RTP media-echo=sinkhole RTCP MQTT stats
- 7. route { # ... if (outwards) { rtpengine_offer(" direction=internal direction=external media-echo=sinkhole generate-RTCP "); } # ... } reply_route { # ... if (outwards) { rtpengine_answer(" direction=internal direction=external media-echo=sinkhole generate-RTCP "); } # ... } RTP SINKHOLE rtpengine & kamailio rtpengine --interface=internal/192.168.0.100 --interface=external/192.168.0.100!1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 8. NAT PIERCING rtpengine & kamailio ● “you start first” - “no, you start first” ○ If you’d like to echo media ○ but the peer can’t send you anything to echo back
- 9. NAT PIERCING rtpengine & kamailio kamailio SIP RTP pierce-NAT rtpengine dummy RTP NAT
- 10. route { # ... if (inwards) { rtpengine_offer(" direction=external direction=internal pierce-NAT "); } # ... } reply_route { # ... if (outwards) { rtpengine_answer(" direction=external direction=internal pierce-NAT "); } # ... } NAT PIERCING rtpengine & kamailio rtpengine --interface=internal/192.168.0.100 --interface=external/192.168.0.100!1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 11. RTP ECHO rtpengine & kamailio ● “You made this? I made this!” ○ send back incoming media with new SSRC ○ for when you need two-way media without the generation overhead
- 12. RTP ECHO rtpengine & kamailio kamailio SIP RTP media-echo=forward | backward rtpengine RTP echo
- 13. route { # ... if (outwards) { rtpengine_offer(" direction=internal direction=external media-echo=backward "); } # ... } reply_route { # ... if (outwards) { rtpengine_answer(" direction=internal direction=external media-echo=forward "); } # ... } RTP ECHO rtpengine & kamailio rtpengine --interface=internal/192.168.0.100 --interface=external/192.168.0.100!1.2.3.4 --listen-ng=127.0.0.1:12221 Kamailio Config rtpengine
- 14. RTP PUBSUB rtpengine & kamailio ● “Listen up, everybody…” ○ Send an RTP stream once ○ and duplicate it to multiple recipients ○ for SFU, SIPREC, Interception, …
- 15. RTP PUBSUB rtpengine & kamailio rtpengine Kamailio SIP - cid=X, ftag=A, ttag=B RTP offer in: SDP out: SDP answer in: SDP out: SDP subscribe-request in: cid=X, ftag=A out: SDP SIP - cid=Y, ftag=C, ttag=D subscribe-answer in: cid=X, ftag=A, ttag=C, SDP RTP send-only App Interceptor publish in: SDP out: SDP or optionally (if no SIP context):
- 16. RTP PUBSUB rtpengine & kamailio https://github.com/davehorton/rtpengine-client hopefully soon! const Client = require('rtpengine-client').Client; const client = new Client(); client .subscribeRequest(12280, '127.0.0.1', { 'call-id': 'test-call-id', 'from-tag': 'test-tag' }) .then((res) => { console.log(`Received ${JSON.stringify(res)}`); }) .catch((err) => { console.log(`Error: ${err}`); }); rtpengine --interface=internal/192.168.0.100 --interface=external/192.168.0.100!1.2.3.4 --listen-ng=127.0.0.1:12221 --listen-http=127.0.0.1:12280 NodeJS rtpengine-client rtpengine
- 17. THANK YOU Questions? or any time online Twitter: @andreasgranig Email: agranig@sipfront.com join private beta at https://sipfront.com