How can I detect busy Line Phone with MCU ?

[leilarazavi2000]

Hi all

How can I detect busy Line Phone with MCU ?

thanks

 

[budhy]

The Line Busy Tone indicates that the called customer's line has been reached but that it is busy or being rung or on permanent signal. When a line busy signal is applied by an operator, it is sometimes calls a busy-back tone.

Line Busy Tone is Low Tone on and off every .5 seconds.
(Low Tone is 480 Hz and 620 Hz at -24 dBm0/frequency.)

To detect Line Busy Tone with MCU, you have to filtered the tone and than detect on and off signal every .5 seconds

 

[alec82]

hi
u can test lin voltage with adc of micro.if line is busy the voltage droped to 6 v.

 

[budhy]

if line is busy the voltage droped to 6 v.

It is line in use indicator, not phone busy indicator

 

[leilarazavi2000]

Line Busy Tone is Low Tone on and off every .5 seconds.
(Low Tone is 480 Hz and 620 Hz at -24 dBm0/frequency.)

To detect Line Busy Tone with MCU, you have to filtered the tone and than detect on and off signal every .5 seconds

Can you help me to design this circuit ?



Very Thanks

 

[manish12]

if you know the , what kind of signal you have than what is your problem ?
plz more specific.

 

[VSMVDD]

if anyone here actualy knew what there on about it would help

all signals busy line, connected, message reached
send a 9600baud blip of data as a paket of several bytes

containing these codes

each country / region system uses its own protocal

so hunt this info instead

 

[aldevan]

you can use a NE567 look in google you can found a lot of circuit