[Asterisk-Users] sip register and nat

[Kubat, Philip]

This may be a newbie SIP/NAT question.  If so I am sorry.  But any help
would be appreciated.  My Asterisk server is behind an ipchains box and I am
trying to connect to Broadvoice.  All works fine without the NAT.  I have a
global nat=yes prior to my register, but the sip debug allows shows "no
nat)".  Is this "label" issue, and am I barking up the wrong tree?

Sip.conf....
nat=yes
register => 1235551234: password @sip.broadvoice.com:5060/1235551234

sip debug....
Retransmitting #5 (no NAT):
REGISTER sip:sip.broadvoice.com SIP/2.0
Via: SIP/2.0/UDP 1.2.3.4:5060
...
Event: registration
Content-Length: