Sequence of events/signals that occur on PC side on PSD dial-up through atd*99#

[Fairy]

Hi,

When I try to make a PSD call through dial-up using AT command atd*99#,

what are the sequence of events that occur on PC side.


I am making dial-up on UART using RS-232 cable.


To be more specific,
1) What are the sequence of AT commands that get
executed when we do dial-up for PSD call.

2) What are the signals that flow between DTE(PC) and DCE(modem)
during dial-up.


Please respond if anyone has any idea.


Regards,

Fairy