It depends on a variety of factors.

In one of my more recent designs I chose a cellular modem with a
built-in TCP/IP stack, and simply used that with simple serial
commands.

If yo do not use the built in TCP/IP stack (or if your modem does not
have one) then you'll need to use a PPP stack on the PIC.

PPP is conceptually simple, but like many other protocols becomes
nightmare in the wild.  You might consider finding and using an
existing TCP/IP stack with PPP included.  I don't know what MChip
provides with their TCP/IP, but I'd start in their forums if you don't
get a better answer here.

Good luck!

-Adam

On 11/20/07, srinil <srinil@katuns.org> wrote:
>
> Hi,
>
>        For communication between PIC and GPRS is there necessary to have a
> protocol(PPP) , and if so what type of protocol can be used? what about PPP
> and where i can find the documents related to that, or any readily
> implemented  protocol is available
>
>
> Kumar S
>
>
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