Voice Over Internet Protocol (VoIP) Copyright © 2006 Heathkit Company, Inc. All Rights Reserved Presentation 11 – VoIP Hardware

2 Objectives At the end of this presentation, you will be able to:

3 Explain the purpose of the VoIP Router. Draw a simple diagram showing how the telephone, VoIP Router, DSL Router, and computer are interconnected to each other and to the Internet. Explain the purpose of an analog telephone adapter (ATA). Define the ports associated with SIP and explain why they must be open for SIP-based VoIP. Define the STUN protocol and explain what it does.

4 Analog Telephone Adapter (ATA) DSL Router

5 Analog Telephone Adapter (ATA) Accepts an analog phone. Performs analog to digital conversion. Codec encoding Compression Compaction Encryption

6 DSL Router Connects to Internet Provides Internet service to multiple outlets Provides Network Address Translation (NAT) Provides an Ethernet LAN subnet.

7 Telephone Jacks Ethernet LAN Jacks WAN Jack Power

8 To 120VAC To Internet VoIP Router

9 DSL to Internet DSL Router/Switch

10 DSL to Internet DSL Router/Switch

11 DSL to Internet VoIP Router DSL Router/Switch

12 DSL to Internet VoIP Router DSL Router/Switch

13 Default Ports Associated with SIP Port 5004 – RTP Packets Port 5060 – SIP Commands

14 STUN Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) IT allows an application to discover the presence and types of NATs and firewalls between them and the public Internet.

15 STUN Clients and Servers Client – Generates STUN requests Server – Generates responses to those requests

Voice Over Internet Protocol (VoIP) Copyright © 2006 Heathkit Company, Inc. All Rights Reserved End