This document discusses WebRTC and how it allows audio and video communication directly in the browser without plugins. It describes how WebRTC can be used for more than just calls, including games, dating sites, and more. It also summarizes how WebRTC uses secure protocols for media transfer and network discovery. Janus is introduced as a WebRTC gateway that can connect WebRTC applications to other protocols and services like SIP and RTSP. Examples of WebRTC applications are given and directions provided on how to connect to and use the Janus gateway.

1. Janus, WebRTC and
stuff
oej Foss Stockholm Jan 2019
v1.0

2. WebRTC

3. The idea
Browers can play
audio and video. Why not let them use
the webcam and the
microphone?
If so, users can talk to
each other using the
browser.
Using NO PLUGINS

4. Much more than ”calls”
GAMES
DATING SITES
ART

5. Much more than ”media”
DATACHANNELS
p2p (or
browser2browser)
Anything!

6. Secure peer-to-peer
Using DTLS + SRTP for media
Web Server
“Rendevouz”

7. Much more than browsers
Browser
Thing with
WebRTC stack
Gateway
with WebRTC stack
Something else.
SIP, XMPP, DecNet

8. Much more than browsers
App (no browser)
Thing with
WebRTC stack
Gateway
with WebRTC stack
Something else.
SIP, XMPP, DecNet

9. Much more than browsers
SIP phone SIP phone
Gateway
with WebRTC stack
Something else.
SIP, XMPP, DecNet

10. P2P SCTP over UDP
P2P SRTP
P2P SRTP
Multiple channels
AUDIO
VIDEO
DATA
#moreCrypto

11. WebRTC API
JavaScript API defined by
the W3C
User needs to allow usage
of camera and
microphone.
Defines the session in a
SDP document
The applications needs to
provide the SDP exchange
between peers

12. The WebRTC protocols
Defined by the IETF
No signalling protocol
specified
Use SRTP for media
Use ICE (TURN, STUN) for
network discovery

13. WebRTC media
Can be bundled and
mixed to one single
RTP port
Always use secure
RTP with DTLS key
exchange
Use ICE to find the
best media path
Use TURN to traverse
NAT and firewalls.

14. P2P call setup
Web
Server
Media
SDP SDP
The web application defines the signaling

15. P2P call setup
with network issues
Web
Server
Media
SDP SDP
The web application defines the signaling
TURN
Server
TURN
Server

16. Janus - a WebRTC
gateway
https://janus.conf.meetecho.com/docs/index.html

17. WebRTC to a lot of
stuff
SIP RTSP RTP

18. WebRTC apps
Audio
conference
Video
conference
Your own stuff
in Lua or
JavaScript

19. Connecting to Janus
HTTPS
WebSOCKET
MQTT AMQP/RabbitMQ
Unix Socket

20. Listening to Janus
HTTPS
WebSOCKET
MQTT

21. Building a solution
Web Proxy /LB
Web Server
MQTT server
Janus Server
App Logic
SIP Proxy
Streaming
server (RTSP)

22. Take Janus for a spin
https://janus.conf.meetecho.com/demos.html

23. Thank you!
oej@edvina.net
https://www.slideshare.net/oej