Specifications

AT-VP504E FXS 55
7
Port Configuration
All four ports of the AT-VP504E FXS must be properly enabled and set
in order to work as they should be.
When a telephone connected to one of the AT-VP504E FXS FXS ports
is put on-hook, the AT-VP504E FXS signals this by performing a
current loop drop. The current loop drop, also referred to Power Denial
mode by some manufacturers, is typically used for disconnect
supervision. It signals that the remote telephone has been taken on-
hook. The AT-VP504E FXS will detect a Current Drop if this signal is
maintained for at least 600 ms with an open circuit or has a current drop
lower than 0.4 mA.
Enabling Ports You can independently enable/disable each port of the
AT-VP504E FXS.
To set basic port properties:
1. Locate the port1Enable variable (under port1Grou p).
This variable enables/disables port #1 of the
AT-VP504E FXS.
2. Set the port1Enable variable to 1=Enable.
The AT-VP504E FXS cancels the port registration to the SIP
server when the port is disabled and registers it when the port
is enabled.
Setting Basic DSP
Variables
DSP (Digital Signal Processing) variables define how to transmit the
audio/data signal.
To set basic DSP variables:
1. Locate the port1DspGroup category.
2. Define Jitter Buffer variables.
The jitter buffer allows better protection against packet loss,
but increases the voice delay. If the network to which the
AT-VP504E FXS is connected suffers from a high level of
congestion, the level of jitter buffer protection should be