User's Manual 458 Document #: LTRT-42060
Mediant 2600 E-SBC
The device automatically populates these tag variables with actual values in the sent
header. By default, the device sends the following in the User-Agent header:
User-Agent: Mozilla/4.0 (compatible; AudioCodes;
<NAME>;<VER>;<MAC>;<CONF>)
For example, if you set AupdHttpUserAgent = MyWorld-<NAME>;<VER>(<MAC>), the
device sends the following User-Agent header:
User-Agent: MyWorld-Mediant;6.8.200.001(00908F1DD0D3)
Note: If you configure the AupdHttpUserAgent parameter with the <CONF> variable
tag, you must reset the device with a burn-to-flash for your settings to take effect.
4. If the provisioning server has relevant files available for the device, the following
occurs, depending on file type and configuration:
• File Download upon each Automatic Update process: This is applicable to
software (.cmp), ini files. In the sent HTTP Get request, the device uses the
HTTP If-Modified-Since header to determine whether to download these files.
The header contains the date and time (timestamp) of when the device last
downloaded the file from the specific URL. This date and time is regardless of
whether the file was installed or not on the device. An example of an If-Modified-
Since header is shown below:
If-Modified-Since: Mon, 1 January 2014 19:43:31 GMT
If the file on the provisioning server was unchanged (modified) since the date and
time specified in the header, the server replies with an HTTP 304 response and
the file is not downloaded. If the file was modified, the provisioning server sends
an HTTP 200 OK response with the file in the body of the HTTP response. The
device downloads the file and compares the version of the file with the currently
installed version on its flash memory. If the downloaded file is of a later version,
the device installs it after the device resets (which is only done after the device
completes all file downloads); otherwise, the device does not reset and does not
install the file.
To enable the automatic software (.cmp) file download method based on this
timestamp method, use the ini file parameter, AutoCmpFileUrl or CLI command,
configure system > automatic-update > auto-firmware <URL>. The device uses
the same configured URL to download the .cmp file for each subsequent
Automatic Update process.
Notes:
• When this method is used, there is typically no need for the provisioning server to
check the device’s current firmware version using the HTTP-User-Agent header.
• The Automatic Update feature assumes that the Web server conforms to the
HTTP standard. If the Web server ignores the If-Modified-Since header or doesn’t
provide the current date and time during the HTTP 200 OK response, the device
may reset itself repeatedly. To overcome this problem, modify the update
frequency, using the ini file parameter AutoUpdateFrequency or CLI command
configure system > automatic update > update-frequency.
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