Voice over IP

Posted Wed, 04/01/2009 - 07:35 by administrator

DTMF Frequencies

&nbsp	1209hz	1336hz	1477hz	1633hz
DTMF Tone Frequencies
697hz	1	2	3	A
770hz	4	5	6	B
852hz	7	8	9	C
941hz	*	0	#	D

uhcot.net