asterisk users - Jun 2006 - dss1 progressing message on zap channel

I am going to try to figure out why mu asterisk box connected by back to back
cable to an PRI appliance is not going to send the PROGRESSING dss1 message.
In fact i see the SETUP and the follwing CALL PROCEEDING but not the PROGRESSING
so the appliance doesn't allow the "early audio" !!!!!

this is my zapata.conf
[channels]
context = ser
switchtype = euroisdn
usecallerid = yes
echocancel = yes
echocancelwhenbridged = yes
relaxdtmf=yes
rxgain = -1.0
txgain = 0.0

signalling = pri_cpe
group =1
channel = 1-15,17-31

;Note: Customers in the UK connected to BT might require this parameter:
pridialplan=local
priindication=inband
callprogress=yes
progzone=uk


Any comment about it????

Reagrds
Rosario
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