User guide

During the time of writing (September 2007), the unit can be configured editing the configuration files
via a serial cable or the network interface. The on board memory consists of 64MB SDRAM and 256MB
flash, which can be expanded using an optional removable MMC card up to 4 GB.
7.1 Background
In our first scenario, we want to place a PBX in a rural Telecentre and provide IP telephony to four
organizations in the neighbourhood. After completing the installation, each organization will be able to
place free
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phone calls to both the Telecentre and to each other.
The table below summarizes the information of the four organizations and the different technologies
that can be used to connect them to our PBX. To make the case as illustrative as possible, we have
chosen several different mechanisms to interconnect the organizations. In a real roll out, you should
consider reducing the amount of different appliances to facilitate support and maintenance.
Organization Technology Extension
Community Library VoIP phone using SIP protocol 462
Regional Hospital ATA using SIP protocol 463
Primary School ATA using IAX2 protocol 464
Farmers' Association Two Software Phones using SIP and IAX2 465, 466
7.2 Configuring the VoIP clients
Before describing how to configure the PBX, let us start by setting up each of the VoIP clients.
7.2.1 Community Library
The first client is placed in a public library that is 1 km from the Telecentre. The VoIP SIP phone is
directly connected to our PBX by means of a dedicated wireless link (a point-to-point bridged
connection). The IP address of the VoIP phone [phone]) is in the same network as our PBX
(192.168.46.1) so we do not need to worry about any NAT related problem.
When configuring any kind of VoIP phone, start by reading the user guide to find out how to log into the
web interface.
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When you are logged in, try to locate the following basic parameters in the web
administration interface.
33. Once the infrastructure is in place, the tariffs for internal phone calls could cover the maintenance costs. A community
model can be explored where internal calls are free.
34. There are three main mechanisms to log into a web interface of a VoIP phone. Keypad Method: set the IP address of the
phone using the telephone key pad. DHCP Method: plug the phone into a network with DHCP and monitor the leased IP
address. Factory IP method: find out what the default IP address (factory) is set to.
Page 27 TRICALCAR | www.wilac.net/tricalcar – Version: February 2008