Specifications

Other IP Endpoints Embedded IP Phone Display Driver
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ShoreTel 14 Maintenance Guide 164
IPCS
IPCS manages the IP phone configuration process, including configuration files and the database
updates. Problems with IPCS connectivity can prevent IP phones from booting and prevent phone
configuration data from being updated.
Client Application Server (CAS)
Client Application Server handles the remaining functions, such as event handling and feature button
functions. It also controls any actions by the IP phone display not controlled by the device’s firmware or
switches. Problems with CAS or TMS connectivity can result in incorrect phone displays and errors in
both the hard and soft key functions.
Embedded IP Phone Display Driver
The embedded IP phone display is provided by the server. Control of IP phone features (such as
phone display, redial, and call transfers) are handled on the server. Features that require writing to the
database (such as directory and speed dial) rely on the server.
Date and Time
IP phones depend on an SNTP server to maintain the correct time and date. Without an SNTP server,
you can set the phone date and time via a GMT offset.
IP Phones and ShoreTel Voice Switches
IP phones in a ShoreTel system interact with two ShoreTel voice switches: the configuration switch and
the call manager switch. The configuration switches help the IP phones obtain their configuration from
the ShoreTel server, which functions as a FTP server for the IP phones. You must have at least one
configuration switch and can designate a second configuration switch for reliability.
The call manager switch is responsible for hold, transfer, conference, and park actions.
As part of the configuration information, each IP phone is assigned a ShoreTel Voice Switch that acts
as the phone’s call manager to help the IP phone set up and tear down calls.
Configuration Switches
In a DHCP environment, when an IP phone is enabled, it receives the IP address of the configuration
switch from DHCP and the ShoreTel server. Each system includes at least one configuration switch for
this purpose.
If you have configured the IP phones to start without a DHCP server, you must set the IP address of
the configuration switch manually.
The switches, communicating with the HQ server, determine which switch manages calls for a
particular IP phone. You have the option of assigning two switches to this function, in case one fails.