[Asterisk-Users] Zultys ZIP2

[Asterisk User]

Hello All,

I'm having trouble getting a Zultys ZIP2 to work with Asterisk, along 
with some other troubles in general.

I keep getting a "Got SIP response 481 "Call Leg/Transaction Does Not 
Exist" back from x.x.x.x). Even when Asterisk reports that the ZIP2 
registered correctly, I can't make any calls out from the phone, or 
calls into the phone. Occaisionally I get a busy tone when I try to dial 
also.

This is the entry for the ZIP2 in sip.conf

[phone10]
type=friend
username=phone10
host=dynamic
dtmfmode=rfc2833
mailbox=110
context=sip

Incidentally, when I place the ZIP2 in a local subnet 192.168.0.x, the 
web interface for the phone is quick. But when I place it on a public IP 
address, the web interface is all but unusable and times out 90% of the 
time. However when I ping the phone it comes back with a 1~5ms ping.

Does anyone have any ideas? Has anyone got a ZIP2 to work wth Asterisk?

Thanks in Advance,
Jason