[Asterisk-Users] using asterisk as sip registrar is not working for me

[smadi]

hi;

i have the following topolgy:
asterisk box set with public ip address 1.2.3.4
i have a snom200 sip phone that resides on a subnet with 192.168.0.10 
address which i know have worked previously with vocal

now my sip.conf file looks as follows:
==========================
[general]
port = 5060 ; Port to bind to
bindaddr = 0.0.0.0 ; Address to bind to
context = sip ;default Default for incoming calls

[phone1]
type=friend
host=dynamic
dtmfmode=inband
mailbox=1000 ; Mailbox for message waiting indicator
context=sip
callerid="Me" <2124>
=============================

the phone does not seem to register.   I tried to include the 
192.168.0.10 defaultip address and i tried putting the static ip address 
of the dhcp server which is the gateway to which is the snow phone 
connected.

is there anything specific that i must run to get the phone working?

thanks
m. smadi
zia.com