asterisk users - Jul 2004 - broadvoice/asterisk incoming calls problem

This is what my configuration is:

xxx is my phone
yyy is my secret

[general]
externip=lexon.ws
port=5060
disallow=all
allow=ulaw
context=from-broad
dtmfmode=inband
register => xxx:yyy@sip.broadvoice.com
tos=0x18
srvlookup=yes

[Broadvoice]
type=peer
username=xxx
fromuser=xxx
secret=yyy
host=sip.broadvoice.com
context=from-broad
fromdomain=sip.broadvoice.com
nat=yes
canreinvite=no
dtmfmode=inband
insecure=yes

Incomming calls still fails.
NO SOUND AT ALL!!!

Bart