SORRY: I’m sorry for the duplicates, I had connection problems.
Scenario: AsteriskNow 1.0.1: Asterisk 1.4.18.1, Zaptel 1.4.10 and libpri 1.4.3 (zaptel and libpri both manually recompiled, trying to solve the problem).
Hardware and PRI: Digium TE120P on a E1 PRI line (Italy, provider: Telecom Italia)
Nature of the problem: everything works fine for days, I can receive and start calls from asterisk; suddenly the primary d-channel goes down, and it doesn’t go up back again until I stop Asterisk, reload Zaptel, and start Asterisk again.
How often?: (seems) random 
Logs and command outputs:
/var/log/asterisk/messages
VERBOSE[3216] logger.c: == Primary D-Channel on span 1 down
WARNING[3216] chan_zap.c: No D-channels available! Using Primary channel 16 as D-channel anyway!
asterisk console
asterisk*CLI> pri show spans
PRI span 1/0: Provisioned, Down, Active
zttool shows no alarms or missing IRQs. Only asterisk can’t see the D-Channel anymore, neither if I restart it. I must restart zaptel too in order to get things working.
Configuration:
/etc/zaptel.conf
[code]# Span 1: WCT1/0 “Wildcard TE120P Card 0” (MASTER) HDB3/CCS YELLOW
span=1,1,0,ccs,hdb3,crc4,yellow
termtype: te
bchan=1-15,17-31
dchan=16
Global data
loadzone = it
defaultzone = it[/code]
/etc/asterisk/zapata.conf
[code][trunkgroups]
[channels]
signalling=pri_cpe
switchtype=euroisdn
resetinterval=never
language=it
context=default
loadzone=it
defaultzone=it
channel => 1-15,17-31[/code]
Any help would be very much appreciated!
Thanks,
Federico