144 CHAPTER 5: CONFIGURING TELEPHONE COMMUNICATION SETTINGS
3Com Telephone Configuration
There are multiple configuration steps required to enable a VCX
telephone to work within a VCX system. These steps are described in
various chapters of this guide (see Chapter 1 for an overview).
As described in the VCX Installation Guide, each 3Com telephone in a
VCX system must be configured with the IP address of the primary Call
Processor (also called a Network Call Processor or NCP) and the IP address
of the secondary NCP. When connected to the network and powered on,
this enables the phone to contact the NCP and download the following
information:
■Signaling software that enables the phone to make and receive calls.
■Operational software that determines what features are available
based on the model of the phone.
■An IP address that establishes the phone as an IP device and allows it
to communicate with other IP devices using the Session Initiation
Protocol (SIP).
The phone will automatically receive an IP address only if your network
includes a DHCP server configured with Option 184. If DHCP is not
available, you must manually configure IP address information on the
phone.
When the download process finishes, the phone prompts for the
following information:
■The extension that other phones will dial to communicate with the
phone. The extension is associated with an account that identifies the
user who can use the phone.
■A password the user enters to log in to the phone.
Initial telephone configuration, including DHCP setup, is described in the
VCX Installation Guide. This chapter describes how to use the LUI to view
and change current settings for all supported VCX telephone models.
If a VCX release includes new phone application or boot code, all VCX
phones connected to the system will upgrade automatically. Every 30
minutes each phone sends a message to the Call Server that includes the
software version running on the phone. If a different version has been
installed on the server, then a code download to the phone is initiated.