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

What is Voice Over IP?

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

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

Categories of VoIP

Categories of VoIP Amateur :

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

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

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

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

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.

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 :

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.

How does it work?

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.

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

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

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

The Guts

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

Control Protocols

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.

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 10.30.60.20:5060 From: "Mr Anderson" <sip:099639951@10.30.60.20:5060>;tag=1ACC.8D00 To: <sip:021326001@203.109.130.94:5060>;tag=359870F0-16CD Call-ID: 00C0.95C9.5818.4013.1ACC.8D00@10.30.60.20 CSeq: 5257 ACK Content-Length: 0 Max-Forwards: 70 Contact: sip:099639951@10.30.60.20:5060

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.

Control Protocols H323 :

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

Control Protocols H323 : value H323_UserInformation ::= { h323-uu-pdu h323-message-body releaseComplete : protocolIdentifier { 0 0 8 2250 0 4 } callIdentifier guid '3E940C894E1311D8A33E919F0987C365'H } h245Tunneling TRUE

Control Protocols H323 :

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