asterisk users - Feb 2009 - Asterisk as a dial in server for internet

please in really need help
i looking for an solution some like this.
Laptop/modem(home) -> PSTN -> Asterisk/or other software using an E1 30 
channels with TE122B card or other -> enterprice network services
for data connection.
i'm not sure if Asterisk cmd PPPD do that. or if i need a emulate a software
modem to handle dial in conections
please help