[cisco-voip] How do i decode facility from isdn q931?

[Ivan Ostres]

Hi group,
 
how can I decode Facility info from "debug isdn q931" received form qsig trunk? The message is like this:
 
*Mar  4 21:11:42.492: ISDN Se0/0:15 Q931: RX <- ALERTING pd = 8  callref = 0x8004
        Facility i = 0x91AA068001008201008B0100A11402010C06042B0C09018009564552534F20313032
        Shift to Codeset 5
        Codeset 5 IE 0x32  i = 0x81
 
I would like to know does it carry dial reason (it should be Fwd (NoReply)) and original number? Any tools or documentation available on this subject?
 
Thanks,
Ivan