Example Dhcp Server Configuration - Siemens Asterisk OpenStage 20 Owner's Manual

2.3.8

Example DHCP server configuration

The following description demonstrates by example how a DHCP server can be configured in
order to build up a working infrastructure for OpenStage phones.
The configuration example is tested with ISC DHCP server version 3 running on Debian Linux
(package: dhcp3-server).
On startup, the OpenStage phone sends a DHCP discovery message which contains the
vendor-class-identifier option. The fixed value is OptiIpPhone. This identifier is used
by the DHCP server to send a specified set of sub-options to each OpenStage phone by means
of vendor encapsulated options. The vendor-encapsulated-options option allows for de-
fining custom-made options in either a single series of bytes or a sequence of parameters
which is structured as follows: 1) single-byte vendor-specific option code; 2) single-byte length
indication for the option data (the length does not include itself or the option code); 3) the data
itself in as many bytes of data as are specified in the length indication.
The value of the vendor-encapsulated-options option can either be set directly by cod-
ing the bytes in hexadecimal notation, or, preferably, by using the option space statement.
This statement is available with ISC DHCP 3.0.
To assign the specific vendor-encapsulated-options to the appropriate devices, the use
of classes is recommended. In the example, the class vendor-classes is divided into sub-
classes automatically for each vendor-class-identifier option that is received from the
clients. As OpenStage phones send the value OptiIpPhone, the specifications for theses
phones are defined in the correpsonding sub-class.
A31003-S2000-M102-1-76A9, 06/02/2009
Asterisk - OpenStage Family, Administration Manual
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