asterisk users - Apr 2005 - DNID empty on incoming calls

Hi,

I see others have had this problem. Is there a solution ?
I have a BRI, using zaphfc. If I enable debugging so:
   
   bri debug span 1

and then make an incoming call I can see that the DNID info is
definitely provided by the PSTN - Here's proof:

< Called Number (len= 7) [ Ext: 1  TON: Unknown Number Type (0)  NPI:
ISDN/Telephony Numbering Plan (E.164/E.163) (1) '1842'

(The '1842' is the part of my telephone number that I'm looking for)

But how can I get hold of this info - DNID is empty ?

    -- Executing NoOp("Zap/1-1", "DIALEDPEERNAME   = ") in
new stack
    -- Executing NoOp("Zap/1-1", "DIALEDPEERNUMBER = ") in
new stack
    -- Executing NoOp("Zap/1-1", "DIALEDTIME       = ") in
new stack
    -- Executing NoOp("Zap/1-1", "DIALSTATUS       = ") in
new stack
    -- Executing NoOp("Zap/1-1", "DNID             = ") in
new stack
    -- Executing NoOp("Zap/1-1", "EXTEN            = s") in
new stack
    -- Executing NoOp("Zap/1-1", "RDNIS            = ") in
new stack
 
Many thanks
Thomas