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 new DSCP field.
  • Explain and quantify the need for voice compression and delay in an IP network.
  • Identify the CODEC’s used in voice and video compression – e.g. G711, G729 and H261/3/4.
  • Identify and explain the fields of the Real Time Transport Protocol and Real Time Control Protocol – including carrying 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 scheduling of packets at router/switch interfaces.
  • Describe the use of MPLS to deliver QoS in the WAN environment.
  • Describe the use of VLAN’s to deliver QoS in the LAN environment.

Practical Exercises:

  • Lab Exercise 1: Practical VoIP in the LAN.
  • Lab Exercise 2: Build 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

  • It is assumed the delegates will have a working knowledge of TCP/IP.
 21 Hours

Testimonials (1)

Related Categories