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Course Outline
Objectives:
- Explain the operation of circuit-switched networks.
- Contrast the differences between circuit-switched and packet-switched networks.
- Explain the fields and flags within the IP header, including the DSCP field.
- Explain and quantify the necessity of voice compression and delay management in an IP network.
- Identify CODECs used for voice and video compression, such as G711, G729, and H261/3/4.
- Identify and explain the fields of the Real Time Transport Protocol (RTP) and Real Time Control Protocol (RTCP), including the transmission of DTMF tones.
- Calculate bandwidth requirements for various voice compression algorithms.
- Explain and demonstrate the need for security and encryption within VoIP.
- Describe and explain the H.323 protocol stack.
- Describe and explain call setup and signalling (H.225).
- Describe and explain H.245, fast start, and tunnelling of H245.
- Describe and explain SIP call setup.
- Describe and explain SIP Servers.
- Describe and explain SDP.
- Describe and explain Soft Switching, including MGCP and H248.
- Describe and explain the use of SCTP in backhauling signalling messages.
- Describe and explain the importance of network delay and the need for QoS in the network.
- Describe and explain the differences between reservation and prioritisation QoS in an IP Network.
- Describe the use of IntServ and RSVP in QoS.
- Describe the use of TOS and DiffServ in QoS.
- Describe and explain the need for multiple queues and intelligent packet scheduling at router/switch interfaces.
- Describe the use of MPLS to deliver QoS in the WAN environment.
- Describe the use of VLANs to deliver QoS in the LAN environment.
Practical Exercises:
- Lab Exercise 1: Practical VoIP in the LAN.
- Lab Exercise 2: Build an IP network, make calls, and examine RTP packets using Wireshark.
- Lab Exercise 3: Make calls and examine SIP packets using Wireshark.
- Lab Exercise 4: Make calls and examine H323 packets using Wireshark.
- Lab Exercise 5: Calls between PSTN and IP Networks.
- Lab Exercise 6: Configure QoS and make calls to examine effects.
- Lab Exercise 7: Security and VoIP.
Equipment used in Practical Sessions:
- Cisco 2600 series and 2800 series voice-capable routers and Cisco ASA 5505 Firewalls. IP telephones, softphones, and analogue telephones as required. SIP client and server software as required.
Requirements
- Delegates are expected to possess a working knowledge of TCP/IP.
21 Hours
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