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DTMF from telephone line to RS232 (PC port)

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Khaled Eissa

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dtmf rs232

to All:

I need to interface to 3 telephone lines using one circuit and detect any dialed numbers on any of the three lines and send each dialed digit it to rs232
Also disconect line when need to.
Can add more lines to reach 8 lines in future.
LCD same thing

Some more feature will be requested
This a project to work for and get paid
If you are interseted email me at:
idegyptsys@yahoo.com
dashmisr@hotmail.com
 

armsgroup

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rs232 to telephone line

i think you will ring detector to each line and the output of ring detector open the line to the caller ID cit you may need analog switches such as 4053 to make this multiplexing
 

mos

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phone dtmf rs232

also i need to know the solution
 

kienvtc

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telephony to pc interface rs232

Use IC to receive DTMP and microcontroler to send digit to PC.(MT8888 and 8051). You can use chip FPGA chip for all.
 

FSio

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detector de dtmf en pc

Khaled Eissa,
I can help you to design it.

If you like I can send you a Bloks Diagram that parts of you need.

Rgds
 

cybersan2002

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interface lcd telephone to rs232 pc

HI
You can use IC CMX866 from CML Microcircuits.
It has inbuilt DTMF generator & a RS232 interfacing facility.
It also has inbuilt AT command interpreter with which you can dial/answer from PC.
I am also attaching PDF for CMX866
I hope this will help.
Bye
 

cybersan2002

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Moreover you can drive this chip with microcontrollers also,89C51 will be best to use.
 

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