[asterisk-users] Qualify renders all SIP peers unreachable

[randulo]

I totally puzzled by this situation. I have asterisk 1.4.4 behind NAT.
All SIP peers are working properly to place or receive calls.
Any SIP peer or friend whether NATted or not will become UNREACHABLE
if qualify=yes.

I have identical peers on the other asterisk 1.2.16 production server.
In fact, two of the phones (linksys 941 and Polycom ip500) are using
one line for each asterisk. The 1.2 one works normally, the 1.4 does
not.

The sip confgs from "sip show settings" are identical on the two servers.

The sip.conf peer entries were moved over exactly.

Ports 5060 to 5065 are forwarded to the asterisk server.

Looking at sip debug, I notice a few differences:

REGISTER from phone:

"Authorization: Digest username="Poly", realm="asterisk",..."

does not show on the 1.4 server.

Trying (sent by *):

"Supported: replaces"

The Via lines are the same (internal ip addresses) on both servers,
but there is a "Sending to 192.168..." on the 1.2 message where there
is none on the 1.4.

What is "supported: replaces" ?

What config setting generates the "Authorization: Digest..." message ?