Page 115 - Asterisk™: The Future of Telephony

# groupadd PlcmSpIp
# useradd PlcmSpIp -g PlcmSpIp -p PlcmSpIp
# passwd PlcmSpIp
Set the password to PlcmSpIp (the default FTP password for Polycom sets). This can
be changed, but will then require manual configuration from each set in order to advise
them of their nonstandard credentials. ‡
For added security, let’s make sure the FTP server keeps that account in a chroot jail:

# echo PlcmSpIp >> /etc/vsftpd/vsftpd.chroot_list
That pretty much does it as far as preparing the operating system to provide the required
services to the phones.
In the next few sections we have provided instructions for various popular SIP tele-
phones. Choose the section that applies best to the phone that you are planning to use
(whether a hard- or soft-phone). You will note that we have given all of these phones
the exact same unique identifier. If you plan on installing more than one of them, you
will need to ensure that they have unique names, and be sure to update your sip.conf
file to include those device definitions.

CounterPath’s X-Lite Softphone

CounterPath’s X-Lite softphone has become very popular with the Asterisk commun-
ity. It is simple, functional, easy on the eyes, and—most importantly—free.
In this section we will be configuring the X-Lite softphone to connect to Asterisk.
The IP address of the phone is 192.168.1.250, and Asterisk is located at 192.168.1.100.
The X-Lite is available for Microsoft Windows, Mac, and Linux. You can obtain a copy
of X-Lite from http://www.counterpath.com/index.php?menu=download.
Now let’s configure our softphone for connecting to our Asterisk box. To configure X-
Lite, click on the Settings button, as circled in Figure 4-2.
Select System Settings → SIP Proxy → [Default], which will display the default configu-
ration for the softphone. Configure the screen as shown in Figure 4-3.
If you have not already started Asterisk, then start it now (see Chapter 3 for help in-
stalling and starting Asterisk). If Asterisk is running in the background, you can
reconnect to the CLI by running the following command:
# asterisk -rvvv

‡ You can get into assigning complex and unguessable passwords for the phones to use, but unless you are
going to input the passwords into each phone manually, you’ll have to pass them their FTP username and
password from the DHCP server. Any device that can get on the voice network can get the same information
from the DHCP server. We’re not telling you to ignore security; just don’t assume that creating separate
passwords for each phone is going to improve security.

Configuring SIP Telephones | 87