asterisk users - Sep 2005 - Asterisk and Zyxel Prestige 2000W_v2

Hi

Has anybody tried to use the Zyxel Prestige 2000W_v2 with Asterisk? I have the
latest firmware
and can now make outbound calls. So it looks like Asterisk does accept the
configuration in
sip.conf. However, I cannot receive any calls. Also, I keep getting this message
on the
console:

chan_sip.c:7733 handle_request: Registration from
'<sip:51@10.99.1.133;user=phone>' failed for
'10.99.1.151'.

TIA

Klaus

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