Missing digits from caller id

I have a TDM410 hooked up to an analog line from KPN in The
Netherlands. CallerID is working but sometimes some digits are missing
from the number, i.e. if the number that calls me is:
0204569236

I will sometimes get this in the display:
2063236

loadzone = us
defaultzone = us

This is my /etc/asterisk/chan_dahdi.conf :
echocancel=yes
echocancelwhenbridged=yes
echotraining=400

signalling=fxs_ks
cidsignalling=dtmf
cidstart=polarity
usecallerid=yes
callerid=asreceived
hidecallerid=no
callwaiting=no
callwaitingcallerid=no

Thanks!
Kees

Howdy,

Please contact Digium support directly via:

digium.com/support

Cheers