Each FXO port should be calibrated when connected to a new device. Calibration reduces echo experienced by users and improves DTMF digit processing. During calibration, the audio level is adjusted based on the electrical characteristics of the circuit.
Before starting:
Configure the Gateway analog interfaces (FXS or FXO) with the Quick Setup Wizard
Ensure the FXO ports are connected
During the calibration process:
The Gateway will stop
Each FXO port may require up to 3 minutes to calibrate
Optimized calibration values will be applied the next time the Gateway is started.