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take a look at atmel, or atmel wireless... they've some chips perfect to produce phones... I've use one of them! it works very well and consumes very little current...
Look up Zarlink or Claire (formerly Teltone). What you are looking fo is called a DAA. Zarlink makes a nice universal module that only requires a few external components to tune it for different country requirements. The app notes are good too, showing the necessary connections.
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