Ring Dection settings specifically for HK Telco Standards:
Physical Interface --> LINE port --> Ring Detection
Ring Frequency Min: 10
Ring Frequency Max: 100
Ring Validation Time: 256 ms
Ring Indication Delay: 512 ms ( same to default )
Ring Timeout: 640 ms
Ring Threshold: 13.5-16.5 Vrms
Ringer Impedance: High (Normal) ( same to default )
Reserved
YH
Reserved
YH