PIC16f877 to make modem call a number

Hi am trying to find out the required AT command set for a microcontroller to connect through rs232 to a modem and call a number. i can do so with hyperterminal with ATDT then number. is this sufficient for the pic to send this.

With AT set do i need to ECHO (E1)? Set Baud rate?
Set Asyncronous(&Mn)

Any HELP please

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