Grandstream Networks GXE502X user manual Current Disconnect Threshold

GXE502X User Manual 7/9/2008

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)

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