asterisk users - Feb 2005 - asterisk@home and grandstream display

Hi,

I'm running *@home 0.5 exactly as it comes off the .iso image and have 
configured an extension (206) using AMP for a grandstream 102.  Have checked 
sip_additional.conf looks ok, but I can't get the incoming cli on the 102 to
read anything other than 't ri', apparently from other posts the phone
is
trying to display 'asterisk'!  I've got a couple of pc's running
x-lite and
an ata 486, all can call each other and the x-lites display the expected 
cli's.  Calls are ok to and from the 102, it's just the display, running
firmware 1.0.5.16.  Username=206 and callerid="IP Phone 206"
<206> in
sip_additional.conf, tried having the number alone as the callerid but still 
no joy.  I've tried all dtmf options but no change.  Any pointers much 
appreciated.

Steve