User`s manual

VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
108
General Settings
This section contains the basic settings for the VoIP service from the provider selected in the Wizard
section. Settings may be altered here if required. Failure to provide correct information will halt making
calls out to the Internet.
SIP Device Parameters
SIP: To use SIP as VoIP call signalling protocol.
Silence Suppression (VAD): Voice Activation Detection (VAD) / Silence Suppression prevents
transmission during periods of silence to reduce bandwidth consumption. Default is set to Enable. May be
disabled to improve speech quality if ‘chopping’ of leading syllables occurs.
Echo Cancellation: G.168 echo canceller is an ITU-T standard. It is used for isolating the echo while you
are on the phone. Default is set to Enable.
RTP Port: Provides the base value from the media (RTP) ports that are assigned for various endpoints
and the different call sessions that may exist within an end-point. (Range from 5100 to 65535, default
value is 5100)
Region: This selection is a drop-down box, which allows user to select the country for which the VoIP
device must work. When a country is selected, the country parameters are automatically loaded.