SIP trunk not responding to 401 Unauthorized

outboundproxy=azmtnbike.carrier.domain.net
host=reg.domain.net
username=0xxxxxxxxxxxxxxx5
secret=password
type=peer
context=from-internal
srvlookup=yes
canreinvite=no
qualify=yes
port=5060

I also have the register string setup as: 0xxxxxxxxxxxxxxx5:[email protected]/0xxxxxxxxxxxxxxx5

It just keeps attempting to Register. This was working until a week ago. I also noticed that it is not attempting to use my outbound proxy, which it use to do.

The CLI reports two events with each registration attempt. “Registration for …timed out” and “Faled to authenticate on REGISTER”

Any ideas? It seems like Asterisk is ignoring the 401 Authenticate.

Thanks