FXS

FXS port configuration allows you to set parameters based on the requirements of the telephony connection. You can alter the default settings and fine-tune the parameters for your specific needs. You can set the following configuration parameters for an FXS port.

Basic Setting

Polarity Reversal	Enable Polarity Reversal – Tip and Ring are reversed when a call is answered.  Please do not change this setting unless necessary.
Max Flash Hook Timer	The flash hook cannot last more than X ms for the BT device to treat it as a Flash Hook.
Min Flash Hook Timer	The flash hook needs to last at least X ms before BT device treats it as a Flash Hook.
DTMF Level	The level of Dual Tone Multi Frequency tones generated by the BT device.  Please do not change this setting unless necessary.

 

Tone Timer

Busy Tone Timeout	Busy Tone will play for X seconds and then drop the call.
Delay Busy Tone	If the phone is in an off-hook state, the time duration that the BT device waits before playing busy tone.
Warning Tone Timeout	TWhen the remote side hangs up and the busy tone time out has expired, the device will start to play warning tone for this period of time.
Ringing Timeout	Will ring a line for this period of time and then cancel the call.
Dial-Tone Timeout	Will play Dial Tone for this period of time and then play fast busy.
Reorder (Fast Busy) Tone Time Out	Will play fast busy tone for this period of time and then play Howler tone.
Howler Tone (ROH) Time out	Will play Howler tone for this period of time and then become silent.
OSI Duration	When a call is terminated, place line in open circuit for X ms. A value of 0 disables OSI.

 

Jitter Buffer Setting

Jitter Buffer Mode	Adaptive – Jitter Buffer size changes during the call in response to network conditions. Fixed – Jitter Buffer Size stays at the configured value. NetEQ – Use the NetEQ algorithm for jitter buffer management and packet concealment. When NetEQ is selected, the ‘Initial Jitter buffer size,’ and ‘adaptation Min Depth’ values are not used.
Initial jitter buffer size	The initial jitter buffer size in ms.
Adaptation Min Depth	If network conditions are good, and no late packets are detected, the jitter buffer will continue to decrease until it meets the configured size.