PPP protocol and RTL-ARM

Hello,
I'm looking for someone who succesfully implemented PPP protocol from RTL-ARM.
I wrote simple program. Device dials phone number through GPRS module but after command CONNECT 115200 doesn't try to establish PPP connection. Modem off-course sends proper PPP frame.
ARM device is connected to GPRS module through RS-232 without link control, only RX and TX wire.

Best,
Piotr

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