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Spud2003
United Kingdom of Great Britain and
Northern Ireland
Busy tone - 400 0.375 on 0.375 off
Congestion tone - 400 0.4 on 0.35 off 0.225 on 0.525 off
Dial tone - 50//350+440 continuous
Number unobtainable tone - 400 continuous
Pay tone - 400 0.125 on 0.125 off
Payphone recognition tone - 1200/800 0.2 on 0.2 off 0.2 on 2.0 off
Ringing tone - 400+450//400x25//400x 16
2/3
0.4 on 0.2 off 0.4 on 2.0 off
The Grandstream tone syntax is -
Syntax: f1=val[,f2=val[,c=on1/off1[-on2/off2[-on3/off3]]]];
(Frequencies are in (10, 4000) Hz and cadence on and off are in (0, 64000) ms)
I'm using a Grandstream HT 801 ...