Avaya 9608 Installation And Maintenance Manual page 26

Installing the Deskphone
Files are stored in five areas of reprogrammable non-volatile (flash) memory in the
deskphones:
• a boot program area,
• two Kernel/Root File Systems,
• one Application File System, and
• one Temporary Storage area.
Two Kernel/Root File Systems are supported in case one becomes corrupted, but only one is
activated when the telephone powers up or resets. Temporary Storage is used to store a new
Signed Application/Library Software Package that has been downloaded by the current
application until it can be installed by a process in the active Kernel/Root File System after the
next reset.
When a telephone starts up, the boot programs check the Kernel/Root File System that has
previously been marked as the one to be activated to ensure that it has not become corrupted,
and if it has not, it transfers control to a process in that file system. If that file system is corrupted,
the boot program checks the other Kernel/Root File System. If that file system is not corrupted,
it is marked as the one to be activated, the value of RFSINUSE is set to the name of the Signed
Kernel/Root Software Package that was used to install that file system, and control is
transferred to a process in it. If both Kernel/Root File Systems are corrupted, the telephone
will not operate and must be returned for repair.
A process in the active Kernel/Root File System first checks whether a Signed Application/
Library Software Package is stored in Temporary Storage, and if it finds one, it installs the
Application Software Package and/or the Library Software Package if either has a different file
name than the currently installed version, replacing the existing corresponding files in the
Application File System. The copy of the Signed Application/Library Software Package stored
in Temporary Storage is then deleted. If a Signed Application/Library Software Package is not
found in Temporary Storage, the process checks the integrity of the application files, and if they
are corrupted, the process installs files from the Backup Package, replacing the corrupted
application files in the Application File System. Any time an Application Software Package or
a Library Software Package is installed, the value of the persistent parameter APPINUSE is
set to the file name of the Signed Application/Library Software Package from which it was
installed. If the application files are not corrupted, or after the Backup Package has been
installed, control is transferred to the application installed in the Application File System. Note
that the processes in the Kernel/Root File System do not connect to the network or download
files.
The application then connects to the network, obtains any necessary IP address information,
and download files, starting with the upgrade and settings configuration files, and including
Signed Software Packages and other separately downloaded files such as Language Files
and Certificate Files. When a Signed Software Package (which can contain either Kernel and
Root Software Packages or Application and Library Software Packages) is downloaded, it is
initially stored in volatile memory (RAM). Other downloaded files (such as Language Files and
Certificate Files) are installed directly in the Application File System.
When either type of Signed Software Package is downloaded, the Signing Authority Certificate
is extracted from the package and is validated using a copy of the Avaya Product Root
26 H.323 Installation & Maintenance Guide R6.1 May 2011