1. VoIP Basics
A high level overview of Voice Over IP and it’s place in the New Zealand Market.

2. What is Voice Over IP?

3. What is Voice Over IP?
The packetisation and transport of classic public switched telephone system audio over an IP network.

4. What is Voice Over IP?
The packetisation and transport of classic public switched telephone system audio over an IP network.
The analog audio stream is encoding in a digital format, with possible compression, and encapsulating it in IP for transport over your lan/wan or the public internet

5. Categories of VoIP

6. Categories of VoIP
Amateur :

7. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.

8. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise :

9. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise : Small IP phone deployments, IP PBX, Cisco Callmanager.

10. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise : Small IP phone deployments, IP PBX, Cisco Callmanager.
ISP/Carrier :

11. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise : Small IP phone deployments, IP PBX, Cisco Callmanager.
ISP/Carrier : Toll Bypass services, VOIP wholesale, using equipment by vendors such as Cisco, Lucent, Avaya, etc.

12. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise : Small IP phone deployments, IP PBX, Cisco Callmanager.
ISP/Carrier : Toll Bypass services, VOIP wholesale, using equipment by vendors such as Cisco, Lucent, Avaya, etc.
Telco Grade :

13. Categories of VoIP
Amateur : Skype, Microsoft Netmeeting, ohphone, gphone, Asterisk* etc.
Enterprise : Small IP phone deployments, IP PBX, Cisco Callmanager.
ISP/Carrier : Toll Bypass services, VOIP wholesale, using equipment by vendors such as Cisco, Lucent, Avaya, etc.
Telco Grade : Local service, Last mile delivery, total phone services, high dependability and availablility.

14. How does it work?

15. How does it work?
VoIP is not a protocol. VoIP is a collection of protocols that allow for the encoding, transport and routing of audio calls over IP networks.

16. How does it work?
VoIP is not a protocol. VoIP is a collection of protocols that allow for the encoding, transport and routing of audio calls over IP networks.
PSTN  VoIP  PSTN

17. How does it work?
VoIP is not a protocol. VoIP is a collection of protocols that allow for the encoding, transport and routing of audio calls over IP networks.
PSTN  VoIP  PSTN
Native VoIP  PSTN

18. How does it work?
VoIP is not a protocol. VoIP is a collection of protocols and devices that allow for the encoding, transport and routing of audio calls over IP networks.
PSTN  VoIP  PSTN
Native VoIP  PSTN
Native VoIP  Native VoIP

19. The Guts

20. The Guts RTP (Real-Time Transport Protocol)
RTCP (Real-Time Control Protocol)
RTP is a UDP stream with no intelligence for QOS or resource reservation
Contains a packet number for detection of packet loss and re-sequencing of out of order packets.
Unidirectional : two streams in any call

21. Control Protocols

22. Control Protocols SIP : Session Initiation Protocol.
SIP is a textual based client server protocol. This makes debugging easy as it’s invite etc messages are human readable.

23. Control Protocols SIP : SessionInitiation Protocol.
SIP is a textual based client/server protocol. This makes debugging easy as it’s invite etc messages are human readable.
200_INVITE:
Via: SIP/2.0/UDP :5060
From: "Mr Anderson"
To:
Call-ID:
CSeq: 5257 ACK
Content-Length: 0
Max-Forwards: 70
Contact:

24. Control Protocols MGCP : Media Gateway Control Protocol.
MGCP is a master/slave protocol where all the smarts resides in the gateway controller and not the gateway.

25. Control Protocols
H323 :

26. Control Protocols
H323 : is a not a protocol itself but a suite of protocols including :
H.225
H.245
T38
RAS and many more…

27. Control Protocols H323 : value H323_UserInformation ::= { h323-uu-pdu
h323-message-body releaseComplete :
protocolIdentifier { }
callIdentifier
guid '3E940C894E1311D8A33E919F0987C365'H }
h245Tunneling TRUE

28. Control Protocols
H323 :

29. Control Protocols SIP MGCP H323
Skinny : Cisco’s IP phone control protocol