asterisk users - May 2006 - no extension from ISDN phone with bristuff

Hello,

I have a Gigaset S44 connected to a quadBRI NT port. Receiving calls 
works phone, however when dialing out from the phone the call is dropped 
to the 's' extension, as if no extension had been dialed:

	-- Accepting voice call from '492389990' to 's' on channel 0/2,
span 4
	-- Executing Directory("Zap/11-1", "default") in new stack
    -- Playing 'dir-intro' (language 'fr')
	etc...

My zapata.conf contains:

	[channels]
	language=fr
	musiconhold=default
	switchtype=euroisdn
	priindication=outofband
	callerid=asreceived
	busydetect=no
	callwaiting=yes
	callwaitingcallerid=yes
	pridialplan=unknown
	nationalprefix=0
	internationalprefix=00
	callgroup=1
	pickupgroup=1
	hidecallerid=no
	usecallerid=yes
	echocancel=yes
	context=default
	;; for TE ports
	signalling=bri_cpe_ptmp
	group=1
	channel=>1-2

	channel=>4-5

	channel=>7-8

	;; for NT ports
	signalling=bri_net_ptmp
	echocancel=no
	pridialplan=local
	prilocaldialplan=dynamic
	priindication=passthrough
	context=international
	group=2
	channel=>10-11

And currently using "Asterisk 1.2.7.1-BRIstuffed-0.3.0-PRE-1n"

When the phone is connected directly to the telco ISDN plug, outgoing 
calls work fine.

What did I forget?

Thanks,