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Help me find solution for phone to phone design

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xvibe

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A phone to phone design

How can I use a phone or cell phone to this flow:
This is a basic phone to phone dial up. You peek your phone dial a number and then some one in the other place answer the call. Then you press some codes in your phone and in the other place is executed something. After the execution the other phone send you a acknowledge that the execution is done. you send another code and the connection is disconneted.

Can I use a modem to do this? the modem receive the dial calling the it anwser the calling. then It waits for the codes and do what is to do.

I hope you could help me.
 

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