AudioCodes 400HD Series User's And Administrator's Manual page 39

CHAPTER 3 Starting up
Setting
Region
preference
Select VLAN Interval.
The 'VLAN interval' refers to CDP/LLDP advertisements' periodic
interval. D efault: 30 seconds. You can increase or decrease the
intervals between the CDP/LLDP packets that are sent, based on
network traffic and topology.
Select the menu option Region preference.
This option allows you to define the country in which the phone is
located. The setting determines which regional tone the phone will
use. Call Progress Tones (CPTs) are country-specific; the behavior and
parameters of analog telephones lines vary from country to country.
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C448HD C450HD | Users & Administrator's Manual
Description