3am: Hong Kong Disconnect tone 480+620 0.5 on 0.5 off
Sipura/Linksys: 480@-30,620@-30; 2(0.5/0.5/1+2)
Asterisk: 480+620/500, 0/500
OBi: 480-30,620-30;10;(.5+.5)
Ringing / ringback tone
3am: Hong Kong Ringing tone 440+480 0.4 on 0.2 off 0.4 on 3.0 off
Sipura/Linksys 440@-13,480@-13; 10(0.4/0.2/1+2,0.4/3/1+2)
Asterisk: 440+480/400, 0/200, 440+480/400, 0/3000
OBi: 440-13,480-13;-1;(0.4+0.2,0.4+3.0)
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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 )