GXE502X User Manual 7/9/2008
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Version 03
This value should be used when the PSTN provider or local Telco Carries uses a line
power drop to indicate call completion to the subscribing end point. In this case the FXO
port of GXE502X will search for a power drop with the preconfigured time frame to
disconnect call from a VoIP extension.
• Current Disconnect Threshold:
This is a preconfigured value of duration for a line power drop used by specific service
providers or Telco Carriers. For example, with a configured value of 500ms, the device
will ignore any random voltage drops on the line if the duration of such a drop is less
than 500ms. The call will NOT be considered as terminated, but will clear a call if a drop
is equal or more than 500ms. This is useful to prevent unnecessary call drops in some
low quality PSTN lines. However inappropriate parameters may cause calls to drop
unexpectedly or cause the line not to release as expected. Please consult with the local
Telco carrier before change this parameter.
• Enable Tone Disconnect:
This feature causes a Busy Tone to be used as the FXO line disconnection signal when
set to YES. Used by some Telcos or enterprise POT PBX.
• Polarity Reversal Disconnect:
If set to “Yes”, calls will be terminated after a polarity signal reversal. The default value
is No.
• AC Terminal Impedance Scheme:
Users can select one of two options for the AC termination scheme: Country (rough
and easy) or the Model of related Impedance values (real and complex).
Please make note that inappropriate parameters may cause echo or popping noises on
the lines.
Please consult with your local Telco Carrier before configuring these fields.
• AC Terminal Impedance:
This depends on whether Country or Model is selected, either 15 Countries are
selectable or users have to select the Impedance value used by the local PSTN carriers.
Call Progress Tones: This feature lets you configure tones to match the FXO line
regional settings.
In certain countries, the carriers or central office will send special tones to indicate certain
events on the PSTN side. For example, when a call is disconnected from the remote side
the other side will hear a busy tone indicating that the call is terminated. Also, a dial-tone is
used by the central office to signal that it is ready to receive digits and process the call.
Users can pre-configure these tones in the GXE502X. However users must know the
correct frequency values and cadences of these tones from the PSTN carrier. Wrong
parameters may cause the GXE502X to malfunction due to incorrect tone settings.
Here is an example for the syntax for a busy tone in the U.S.A:
Syntax: f1=freq@vol, f2=freq@vol, c=on1/off1-on2/off2-on3/off3; [...]
(Note: freq: 0 - 4000Hz; vol: -30 - 0dBm; c: (cadence) in msec, several cadences
allowed)