asterisk users - Sep 2004 - Question calling number

Hello all,

I have a question concerning the calling number with an incoming PSTN call
through a E100P :

Here is what I see with a pri debug :

< Calling Number (len=14) [ Ext: 0  TON: National Number (2)  NPI:
ISDN/Telephony Numbering Plan (E.164/E.163) (1)
<                           Presentation: Presentation permitted, user number
not screened (0) 'XXXX333007' ]
< [6c 0b 20 83 32 34 37 33 33 33 30 33 30]
< Calling Number (len=13) [ Ext: 0  TON: National Number (2)  NPI: Unknown
Number Plan (0)
<                           Presentation: Presentation allowed of network
provided number (3) 'XXXX33030' ]
< [70 05 81 34 32 34 33]

There are two calling numbers : one is the real number (the first one), the
second one is the "group number" (I don't know the correct word
for this, maybe
"head number" of the group ?).
Asterisk is using the second one when I think it should use the first one.

How could I tell asterisk to pick the first number ?
The info is decoded by libpri, so it should be possible to change asterisk's
default behaviour.

Thanks a lot !
Guillaume