asterisk users - Jul 2007 - How to change Zap channel negotiation/exclusive etc..?

Hi,

I just spoke with my telco about a problem I have with some zap channels
getting stuck in "PRI flags: Resetting" when we have a heavy load
(lots
of calls). The technican I spoke with told me that this is most likely
because asterisk says the zap channel should be exclusive and this
causes problems.

I need to try to change this to 'negotiation' or something else, but I
don't understand where I do this. Please help.

Our zapata.conf below:
;
; Zapata telephony interface
;
; Configuration file

[trunkgroups]

[channels] 
language=se
context=from-pstn 
switchtype=euroisdn 
pridialplan=unknown 
prilocaldialplan=unknown 
signalling=pri_cpe 
usecallerid=yes 
hidecallerid=no
callwaiting=yes 
callerid=asreceived
usecallingpres=yes
callwaitingcallerid=yes 
threewaycalling=yes 
transfer=yes 
cancallforward=yes 
callreturn=yes 
echocancel=yes 
echocancelwhenbridged=no 
echotraining=400
jitterbuffers=8
rxgain=-1.0
txgain=-1.5
group=0 
callgroup=1 
pickupgroup=1 
immediate=no 
overlapdial=no
channel => 1-15,17-31,32-46,48-62

group=1
channel => 94-108,110-124

group=2
context=from-internal
signalling=pri_net
channel => 63-77,79-93

;Include genzaptelconf configs
#include zapata-auto.conf

Regards,
Jan