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snom technology AG
[ F
R E Q U E N T L Y
A
S K E D
Q
U E S T I O N
]
As stated in the FAQ „How can I update a
snom phone?”, it is possible to confi gure your
snom phone with confi g fi les, which consist of
the following settings.
Phone
settings
Settings are non-volatile name/value
pairs that are stored in the fl ash of the
phone. They include registration information,
dialled numbers, network settings and
other information that should be available
after rebooting. Settings can be made read
only on a per setting basis. This is useful in
environments where an operator sets up the
phones and wants to avoid users changing
settings that affect the stability of the phone.
In this way, expensive trouble ticket searching
can be reduced and the total cost of ownership
of the phone be minimized.
Settings Files
Setting fi les are ASCII-based fi les
containing lines (terminated with newline or
carriage return/newline pairs). Comments
start with a # or a < character. The < and >
characters allow easy integration of html tags.
Names may consist of the characters a-z, A-Z,
0-9 and _.
Appending a name with an “!” character
means that this setting becomes writable by
the user. Appending the name with an “&”
states that the setting is read only (this is the
default). If a setting is marked writable, the
value in the settings fi le is only written to the
phone if that setting has not yet been set up at
the phone. In order to overwrite such settings,
do not append the setting name with “!”.
A sample fi le looks like this:
<html>
<pre>
#This is a settings fi le
#
phone_name: testphone
dns_domain: intern.snom.de
dns_server1!: 192.168.0.9
</pre>
<html>
Downloading procedure
Settings are downloaded from web
servers. HTTP is a very powerful way to get
confi guration information from anywhere in
the world. The location of a fi le is described as
a URL, i.e. it begins with http://.
This is how the Settings are set up:
1. The settings that were stored in the
fl ash memory are read.
2. Network and DNS is set up. This allows
the phone to get settings from internet
URLs.
3. It then checks the setting "setting_
server” and loads the settings stored in
the URL (e.g. http://www.snomag.de/
snom200/snom200.htm) provided. For
a small description of the fi le format,
see below. The setting_server URL
can also consist of a {mac} statement
like http://www.snomag.de/snom200/
snom200.php?mac={mac}. The MAC
address is a unique identifi cation ID of
Ethernet devices. snom devices have
the form 000413xxxxxx, where xxxxxx
is a hexadecimal number identifying
the snom device. The MAC address is
automatically replaced from the phone
with its own mac address before using
the URL. So phone specifi c settings can
be provided for each phone via this
mechanism. The “setting_server” setting
can be set manually via webinterface or
automatically via DHCP (options 66 and
67) and through snom4S SIP proxy.
4. The de facto settings are added. These
settings may differ from what has been
set up because DHCP may have changed
them. The settings include:
•
the IP address of the device,
•
the net mask,
•
the IP gateway,
•
the hostname,
•
the DNS domain, fi rst and second
DNS server,
•
the UTC offset in seconds,
•
the time server,
