asterisk users - May 2004 - polycom ip 500 registration problems

hello all,

I'm having problems getting my polycom soundpoint ip 500 working, and 
was wondering if anyone would be willing to share their config files 
with me (the polycom configs). I have managed to get my boot server up 
and running, and the phone successfully updated its ROM, and downloaded 
the config files i have put together for it (the display shows 
correctly but the line won't register).

in asterisk sip.conf i have a usual configuration:

[polycom1]
type=friend
host=dynamic
context=home
secret=mypasswd
callerid="Polycom Line1"
nat=yes
canreinvite=no
mailbox=2400
qualify=yes

Any help is greatly appreciated.

regards,

-steve