Analog FXO Trunk Settings
This topic describes all the settings on an FXO trunk for reference.
Basic settings
Setting | Description |
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Name | Give this trunk a name to help you identify it. |
RX Volume | Set the receiving volume of the FXO port. |
TX Volume | Set the transmitting volume of the FXO port. |
Advanced settings
The advanced settings require professional knowledge of analog telephony, carefully configure the advanced settings, or the trunk would not work. For different PSTN providers, you may need to adjust the advanced settings to suit your situation.
The following settings are included on the Advanced page.
- Hangup Detection
- Hangup Detection settings help the PBX to detect if a call is hung up. If you find outbound calls through the FXO trunk cannot be disconnected, adjust the Hangup Detection settings.
- Answer Detection
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Setting Description Answer Detection Method Specify the method to detect if a call is answered. This setting affects the accuracy of call duration tracking.
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[None]: PBX will start counting call duration after you use the FXO trunk to call out, whether the call is answered or not.
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Polarity Reversal: If this option is selected, PBX will start counting call duration after a polarity signal is detected.
Note: Before you select this option, contact the PSTN provider to check if they supports polarity.
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- Caller ID Settings
- Caller ID Settings helps the system to detect Caller ID. If an incoming PSTN call does not display Caller ID, you need to confirm with your service provider if the line has enabled Caller ID feature. If this line does support Caller ID, configure these settings to solve this problem.
- Other Settings
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Setting Description Ringing Detection Timeout (ms) FXO (FXS signalled) devices must have a timeout to determine if there was a hangup before the line was answered. - Valid value: 1000-10000
- Default value: 5000
Echo Cancellation Enable or disable echo cancellation. DID Name
DID Name is used to identify which telephone number was dialed. When an inbound call reaches the trunk, the name will be displayed on the called party's device. Inbound to Outbound Number This setting is typically for Inbound Route to Outbound Route feature. If you wish the inbound call through this trunk to be redirected via an outbound route, enter the destination number in this field.
Inbound Caller ID Reformatting
When a user calls in the PBX, the trunk provider may send a caller ID that is inconvenient for you to redial directly.
In this case, you can reformat inbound caller ID based on a trunk. The caller ID will be reformatted before it is sent to the called party.
For more information, see Reformat Inbound Caller ID based on a Trunk.