[Asterisk-Users] X-Lite behind NATed ADSL router

[Araba, Michael]

The X-lite client is installed behind an ADSL router and it seems the ISP
also has a firewall supposedly protecting their ADSL customers blocking some
netbios ports and non-critical.

I can't make outbound calls but I can receive but before then I had to use
the following in the account section in SIP.conf

[2222]
...
type=friend
secret=xxxx
host=dynamic
;dtmfmode=inband                ; Choices are inband, rfc2833, or info
nat=yes
callerid = "xxxxxx" <(216) 22222222>
defaultip=x.x.x.x


I keep getting this error when I enable SIP Debug.

Transmitting (NAT):
SIP/2.0 401 Unauthorized

Does have an idea what is going on?