[Asterisk-Users] pickup problem on Asterisk 1.2.4

[Francesco Angi]

Hi everybody,
I'm facing a strange problem after upgrading Asterisk from 1.0.9 to
1.2.4.
Sometimes, when receiving an incoming call from pstn, although my sip
phones ring correctly (I've got both softphones and hardware phones),
noone can pick up the call. Asterisk CLI shows me that the phones are
ringing, then nothing happens, so there's no problem _after_ someone
picked up, simply Asterisk doesn't notice a phone picked up!
Upgrading Asterisk I only did some changes to my dialplan, according to
the upgrade page.
My card is a TE110P, this is my zapata file:

[channels]
language=it

context=default

signalling=pri_cpe
switchtype=euroisdn

overlapdial=yes

pridialplan = unknown
prilocaldialplan = unknown      
nationalprefix = 0
internationalprefix = 00

echocancel=yes
echotraining = 100
echocancelwhenbridged=yes

immediate=no
group=1
language=it
musiconhold=default
channel => 1-15,17-31



Thanks for help,
_fangi_