Switching to VoIP

This is the Title of the Book, eMatter Edition

Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

VoIP or IP Telephony

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Some IP phones offer a Telnet interface rather than a web-based one. To use these

tools, one must connect to the phone with a Telnet client instead of a web browser.

In any event, once the network configuration is set on the IP phone, ping its address

from another host on the same network subnet to make sure it’s speaking TCP/IP.

A simple VoIP test network

Throughout this book, a TCP/IP network is used to illustrate Voice over IP concepts

through projects and hacks. This network, illustrated in Figure 2-5, is structured as

follows:

• IP hardphones have an IP address of 10.1.1.100–150.

• IP softphones and ATA devices have IP addresses of 10.1.1.200–250.

• VoIP servers and nonendpoint devices, like proxies, have an IP address range

of 10.1.1.10–29. The Asterisk server we use will always be 10.1.1.10.

• The default gateway router’s address is 10.1.1.1.

• The subnet mask for all devices is 255.255.255.0, giving our test network a max-

imum size of 254 possible devices or an 8-bit subnet.

• DHCP will not be used, except as noted in specific projects.

• The test network will always use wired, switched Ethernet, unless specifically

noted.

• It will consist of one segment, or one Ethernet LAN, unless specifically noted.

• This test network requires access to the Internet ...