H323 Telephone Installation Page 37
Issue 23e (Friday, February 15, 2019)IP Office™ Platform 11.0
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Installation: DHCP Settings
2.3.2 System Site Specific Option Numbers
When requesting address settings from a DHCP server, each phone also requests additional information that the DHCP
server may have. It does this by sending a Site Specific Option Number (SSON). If the DHCP server has information
matching the SSON, that information is included in the DHCP response.
1600 and 9600 Series phones use 242 as their default SSON. However, through the phone's own menus the SSON it uses
can be altered . For those phones using the IP Office system for DHCP, the SSON numbers that the IP Office supports
are set in the IP Office system's configuration. The values used by the phones and supported by the IP Office system
must match.
To changing the system's SSON settings:
1. Using IP Office Manager, retrieve the configuration from the system.
2. Select System.
3. Select the LAN1 or LAN2 tab depending on which of the system's LAN interfaces you want to use to support
H.323 extensions.
4. Select the VoIP sub-tab.
5. Check that the site specific option number settings match those required for the phones being supported. The
default for 1600 and 9600 Series phones is 242.
6. If this setting needs to be changed, save the configuration back to the system.
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