The document discusses Session Initiation Protocol (SIP), including its applications, codecs, and components relevant for voice and video communication. It covers technical details such as SIP trunking, session management, and codec options, along with considerations for network configurations and bandwidth. Additionally, it promotes SIP training and certification through 'The SIP School', emphasizing its endorsement by the Telecommunications Industry Association.

1. Graham Francis, CEO The SIP School

2. What SIP is
SIP issues / Resolution
SIP Trunking craziness
SBCs and why?
ITSP what’s on offer?
Advice!

4. SIP SIP
SIP

5. Sessions
Initiates
Protocol

6. Session Initiation Protocol - INVITE
1002 1003
Call 1003 Want to talk? SIP
SIP
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
Hold Video Hold Video
SDP
1 2 3 1 2 3
Audio Codec – G711 or … Audio Codec – G729
4 5 6 4 5 6
7 8 9 7 8 9
* 0 # * 0 #

7. Session Initiation Protocol – 200 OK
1002 1003
Call 1003 Want to talk? SIP
1002 OK
SIP
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
Hold Video Hold Video
SDP
1 2 3 1 2 3
Audio Codec – G711 or … Audio Codec – G729
4 5 6 4 5 6
7 8 9 7 8 9
* 0 #
SIP 200 OK * 0 #
SIP
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
SDP
Let’s use G711…!

8. Session Initiation Protocol – ACK
1002 1003
CallCall
On 1003 ACK SIP
On Call
with 1003 with 1002
SIP
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
Hold Video Hold Video
SDP
1 2 3 1 2 3
OK, G711 it is….!
4 5 6 4 5 6
7 8 9 7 8 9
* 0 # * 0 #
Voice ‘Stream’

9. Session Initiation Protocol – Video?
1002 1003
On Call Support Video? SIP
On Call
with 1003 SIP
with 1002
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
Hold Video
SDP Hold Video
Audio Codec – G711, G729
1 2 3 1 2 3
Video Codec – H.264,H263,H261
4 5 6 4 5 6
7 8 9 7 8 9
* 0 #
SIP OK * 0 #
SIP
From: ‘Bob’ <sip:1002@sipbiz.com>
To: <sip:1003@sipbiz.com>
SDP
Let’s use G711 and H.264
Voice and Video ‘Streams’

10. Enable UC

12. Request for Comments ~ RFC
They’ll love this!
Awesome!
Individual
Working Group

13. SDP SIMPLE
INFO
Load
Balancing
P2P
SIP
REFER
SIP
Routing
With ENUM
Overload RTP for
Control SIPREC

14. The road to compatibility
344
475 Can
May 381
Option 144

17. It’s an Obsession

18. 40% – 80%
savings
but not the only benefits!

19. Lines – You choose
DDIs – How many?
Virtual Presences
Disaster Recovery
Flexible Provisioning
Branch 2 Branch £0?

20. By 300,000 channels PA
Ofcom Communications Market Report, published in August 2011 Images courtesy of Gamma telecom

21. 2018
PSTN

22. SESSION
BORDER
CONTROLLER

23. Traffic
Bandwidth
Codecs
QoS
NAT
Security

25. Call Traffic Measurement

27. Measure = 10 Trunks please
Voice = G.711 @ 90Kbps
Pipe = 10 x 90Kbps = 900Kbps
If using a 2Meg link
That’s ~ 44% for VoIP and the
rest for Data – Fully loaded…..!

28. Measure = 10 Trunks please
Voice G.711 @ 90Kbps
Video H.264 approx. 250Kbps (min)
Pipe = 10 x 340Kbps = 3.4Mbps
If using a 2Meg link, oops!

29. ITSP Supply this line?
Degradation
Multiple lines needed?
Cable, Ethernet?

35. Let’s leave the video this time
L7 SIP ~ 192.168.1.1 L7 SIP ~ 192.168.1.1
77.128.13.88
L3 IP ~ 192.168.1.1 L3 IP ~ 77.128.13.88
L7 SIP ~ 192.168.1.1
77.128.13.88
L3 IP ~ 77.128.13.88

37. What?
ITSP
Network
Your PBX
REGISTER SIP Registrar
Client X
10 Trunks
Authentication
G.711
Authorization
Call Rates
Encryption
Voice – YES
• Signalling
Video -Traffic
• Voice NO

38. SESSION
BORDER
CONTROLLER

39. ITSP
Network
Your PBX
REGISTER SIP Registrar
Secured
G.711 G.711 to G.729 G.729
SIP Signaling
Media

40. So, do you have
this device that
will do it all
for you?

41. Does the Provider
tell you that
you don’t
need one?

42. ITSP
Network
ITSP
‘inner’
Client 1
Network
SIP Registrar
Client 2
Client 3
Client 4

44. PSTN
ITSP Offerings
Can we have our ‘old’ numbers please?
We need some more DDI’s
PBX
Router That’s us 
Nocourse!
Of problem
Can I have a ‘London’ number?
PSTN

45. PSTN
ITSP Offerings
We need more lines more our marketing push!
Thwarted
PBX
SHA / TLS / SRTP
Router I’ll do that!
I can do that via our Web Interface
PSTN

46. Ask ITSP Interop Qs
Ask PBX vendors
RFC Compliance?

47. Rental Price per
Trunk/Channel/Session
Unlimited Trunks for a
fee / month
Call charges

48. Interesting but
we’re not done
% yet!
50
40
30 ITSP
20 SBC
10 PBX
0
2011 2012 2013
18% had no problems at all

49. I Our Trunks
Must are fine, it’s
check.. hope
not us!
Our SBC
Our PBX
is good!
is good!

50. NEW ONE PLEASE

51. SIP SSCA®
SIP School Certified
Associate
SIP SSMP™
SIP Sales and Marketing
Professional

53. The Telecommunications Industry
Association (TIA), the leader in
advocacy, standards
development, business development and
intelligence for the information and
communications technology industry, has
officially endorsed ‘The SIP School’ as the
provider of choice for training and
certification for Session Initiation Protocol
(SIP).

55. SRTP
Signaling
Real Time JS
Media engine SIP
Voice / Video
Gateway
Data
Internet
Internet
PC World
Web server

57. FINAL SIP IS EVERYWHERE?
Even here!

58. discount Code ~ UC2013
graham@thesipschool.com
www.thesipschool.com