Thanks for replying my question. well you can see my circuit over here


and also my problem in detail is given below


http://www.angelfire.com/ak/shahzad73/Speaker.gif


First circuit is the Speaker interfaced with the 8052 pin. 8052 generate a short frequency on its pin and speaker produces some sound. This sound in produced because of pressing of keys on keypad.

Second circuit is the ISD chip which can replay a stored voice message from speaker. Also I want this message goes to telephone interface chip which can play this message on the telephone line.

So all these three function are working.
- Speaker sounds when key pressed
- Message is played on Speaker from ISD chip
- Message is also played on the telephone line

But all of them working individually.. means Keypad beep circuit has its own speaker. ISD chip has its own speaker and when I want to play the message on telephone I remove the speaker and connect the S + - pins with telephone interface.

SO first I want to have only speaker in my system when keypad is pressed speaker should sound. When ISD plays message it should sound on speaker. and I also want to control if I want to send message to the speaker or to the telephone line. Playing message both on speaker and telephone line is also acceptable to me, means when message is being played on the telephone it can be listen on speaker.. but best will be that I can control where to send the message …. To speaker or telephone line. You can see that I just need those two leads from ISD chip to connect directly to speaker or my telephone interface.




Thanks
Shahzad