Asterisk as Dial-IN Ras from sip-trunk

Hi all,
How can I use asterisk as Dial-IN RAS Server using PPP?

I have several modem and POS that connect to my SIP Trunk number , I want set asterisk to send IP address to pos/modem and permit them to login my network via sip trunk .

1- how can I do it ( I see the Asterisk cmd PPPD but It can work only with Serria ISDN , not for Sip trunk )
2- is it possible for asterisk to authenticate Dialin User using ppp protocol ?

It’s not possible for Asterisk to do this over SIP.

I am using asterisk for SIP to PRI Converting and it working fine . it mean I am using asterisk to convert SIP Trunk and register it to E1 PRI Cart for outgoing .
now I decided use IAX Modem as soft modem . and convert data from asterisk to mgetty modem pool .
I thinks it is possible but meybe a littel hard .
any idea about it ?
1- using mgetty and ppp as modem pool ( it is possible )
2- using iaxmodem as softdemodem ( it is possible )
3- and using asterisk as SIP trunk Dial Signal ( it is possible )
all I want to know is convert step 1 to step 2

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