Advanced Settings of FXS Extension
This topic describes the advanced settings of an FXS extension.
VoIP settings
If you enable Linkus clients for an FXS extension, you may need to configure the following settings:
Setting | Description |
---|---|
DTMF Mode | Set the mode for sending DTMF tones.
|
Transport | Set the transport protocol.
Note: If you change the transport protocol, you must re-register the
extension.
|
Qualify | Enable this option to send SIP OPTION packet to SIP device to check if the device is up. |
T.38 Support | Enable or disable T.38 fax for the extension. Note: Enabling T.38
will add performance cost. We recommend that you disable
T.38. |
NAT | Enable this option when the PBX uses a public IP address.
The feature is enabled by default. Note: If you manually set up Linkus
server, make sure the desired extension's NAT is enabled, or the
extension user can not access Linkus when he or she is out of local
network. |
SRTP | Enable SRTP for voice encryption. |
Hotline
Hotline feature allows a phone to automatically dial a pre-configured number when the user goes off hook and a specific time interval passes.
Setting | Description |
---|---|
Hotline | Turn on the option to enable hotline feature. |
Hotline Number | Enter the hotline number. Note: Only numbers, space, and
( ) . -
+
*
# are allowed. |
Delay Dial (s) | Enter the waiting time (in seconds) before automatically
dialing out the hotline number. Note: Only numbers are
allowed. |
Flash Detection
Set an amount of time to help the PBX identify if a hook flash is a valid event.
Setting | Description |
---|---|
Min Flash Detection (ms) | Set the minimum amount of time. The default value is 300. To change the value, select a value from the drop-down list. Valid values: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 |
Max Flash Detection (ms) | Set the maximum amount of time. The default value is 1000. To change the value, select a value from the drop-down list. Valid values: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 |
Volume Settings
Set the transmitted and received volume of PBX.
Setting | Description |
---|---|
RX Volume | Set the volume from the analog phone to the PBX's FXS port.
The default value is 40%. To change the value, select a value from the drop-down list. Valid values: 5%, 10%,
20%, 40%, 60%, 80%, 100%, 150%, Custom Note: If you choose
Custom, you must go to
RX Gain (db) field to enter
an integer between -30 and 12. |
TX Volume | Set the volume from the PBX's FXS port to the analog phone.
The default value is 40%. To change the value, select a value from the drop-down list. Valid values: 5%, 10%,
20%, 40%, 60%, 80%, 100%, 150%, Custom Note: If you choose
Custom, you must go to
TX Gain (db) field to enter
an integer between -30 and 12. |
Options
Setting | Description |
---|---|
Call Waiting | When receiving an incoming call during an active call, the user can hear a weak beeping sound that informs the user of the new incoming call. The user can press FLASH key on the analog phone to toggle between incoming call and the current call. |
DTMF Passthrough |
If this option is enabled, PBX will not process the DTMF tones, and pass DTMF tones transparently to the other end. |
Echo Cancellation | If this option is enabled, PBX removes extra noise and improves sound quality during a call. |