RTMMoIP

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Title: RTMMoIP

1
RTMMoIP

2
PLAN

Getting to know SIP better essential structure
of SIP messages
Beyond the single User Agent more complex SIP
networks
Have you played with SJPhone? Some thoughts on
your telecommunication status right now

3
SIP messages

4
User Agents
UAS server
UAS server
Request
Response
UAC client
UAC client
5
Requests/Methods

6
Responses / Status(es)

7
Headers

Quite a few
To, From, Cseq, Contact, Subject, Via, Accept,
Accept-Language, Accept-Encoding, Authorization,
Content-Type, Content-Length, Date, Encryption,
Expires, Hide, In-Reply-To, Organization,
Max-Forwards, etc

8
Body

Not compulsory
Typically a description of the session, typically
done using SDP, Session Description Protocol
BTW, the session description includes what other
protocols to use for the actual session. For
voice/video session, typically RTP (Real Time
Protocol)

9
While exploring

A very useful resource while making sense of SIP
and related protocols is the RFC sourcebook that
you can find at
http//www.networksorcery.com
(folllow the links RFC sourcebookgtProtocols)

10
Ok, we are ready for some fun!

Lets go checking SIP messages in a UA-to-UA
situation, using Ethereal.
We wont be exhaustive in our analysis SIP is
simple, but it is still a full blown protocols
for real entities living in a complex
environment!
Naturally, we will quickly check some of the
related protocols (SDP, RTP)

11
Introducing the server
12
Types of SIP servers

13
Our SIP server, SER

Sip Express Router (sip.ict.ru.ac.za) in our
system acts as proxy registration server, never
as a redirect server
Open source, large volume
Info about it at www.iptel.org