Trazas Con Sip Y Wireshark

Study copy downloaded by Xchel T. Miranda Limon of Damovo Mexico on 24/04/2012

CORE SIP
PLEASE READ CAREFULLY
This PDF may help you make notes as you work through the online course. It is
provided 'as is' and is only for use by the student who downloads it. Please see the
header of each page.
Slides may not fully represent what you see on the online training (in fact some
slides areblank where quizzes and other animated elements and embedded
webpages should be) and again, this PDF is an 'aid' not a replacement for the online
material. Images are not of the same quality as seen online due to PDF compression
settings
The 'principle' of the online material is that as SIP evolves, so does the online
material. Consequently, a PDF you download today may not reflect what's on thescreen tomorrow.
This PDF is not for distribution of any kind and is protected by copyright for Vocale
Ltd, the owner of The SIP School. Distribution of any kind will result in your logon
being revoked plus any additional action that Vocale Ltd deems necessary.

Benef its of SIP
sip:joe@voip.com

SIP

Topics

Basics of SIP
Components and Addressing
Serv ers and Operation

SIPSIP Client conf ig
SIP messaging and SDP

SIP
SDP
PSTN

SIP Mobility
Proxies and Routing
MIME and SIP
SIP + the PSTN

SIP

B2BUA
Summary + Quiz

Copyright Vocale Ltd and The SIP School - and Not for distribution

Study copy downloaded by Xchel T. Miranda Limon of Damovo Mexico on 24/04/2012

SIP – The Session Initiation Protocol

• What is SIP?
– Session Initiation Protocol– Signalling Protocol
– Controls Multi-Media
Sessions
– Establish user Presence
– Locate users – SIP mobility
– Setup, Modify and Tear
Down Sessions

SIP ‘Official Summary’

From IETF RFC

3261 Session Initiation Protocol Document

“SIP is an application layer signaling
protocol that defines initiation,
modification and termination of
interactive, multimedia communicationsessions between users”
http://www.ietf.org/rfc/rfc3261.txt
[Supersedes RFC 2543]

Based on HTML

• Just like HTML and SMTP, SIP is a
textual based protocol that is based
on the client-server model.
• Requests from a client device are
sent to a server device which then
responds to the client.

REQUEST
RESPONSE

• This request invokes a method on
the server which normally makessomething happen

Copyright Vocale Ltd and The SIP School - and Not for distribution

Study copy downloaded by Xchel T. Miranda Limon of Damovo Mexico on 24/04/2012

Where does SIP fit in?

M edia C oding [G .711, G .723, G .720, iLBC etc.]

SDP

RTP

SIP

Applications

Transport

RTC P

TC P

DN S

DH C P

U DP

IP v 4, IPv6

Network

Link & Physical

ATM

Ethernet

Wireless

SIP Clients and Servers

•
•
•
•
•
•

User Agents
Registrar Servers
Proxy Servers
Redirect Servers
Location Servers
SIP Gateways

SIP User Agents

• User Agent Client (UAC)
– An entity that initiates a call

• User Agent Server (UAS)
– An entity that receives a call

REQUEST
RESPONSE

• A User Agent (UA)
– Is an entity that is both a
UAC and UASCopyright Vocale Ltd and The SIP School - and Not for distribution

Study copy downloaded by Xchel T. Miranda Limon of Damovo Mexico on 24/04/2012

Simple Call Session Setup

INV IT E sip:jane@vocaletraining.com

UAC

200 OK

UAS

ACK

Media Stream

BYE

200 OK

The URI - Unique Resource Identifier
A URI (Unique Resource Identifier) is a string that identifies
some kind ofresource
An Example of a URI is graham@vocaletraining.com
This URI is an identifier as we all know that it’s an email
address but does it tell you how to move emails to this
address? It’s just an identifier!

A URL (Unique Resource Locator) is a form of URI that not only
identifies a resource but tells you how to reach the resource
An Example of a URL is http://www.google.com
This tells...