[SR-Users] REGISTER failure_route 401 problem

[Marc Soda]

I have a Kamailio server setup which is registers to a back end server on
behalf of endpoints.  The endpoints can register to Kamailio but Kamailio
is failing to register to the server when I put a NAT device in front of
it.  Without the NAT device it works fine.

The problem is the 401 that comes back seems to be ignored by Kamailio.  I
have a failure route setup to auth, but it is never hit.  I see the 401 in
onrely_route, but not the failure_route.  I'm assuming it's a NAT issue
because removing the device fixes the issue.

Anyone have any ideas?

The 401 being ignored:

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP
10.0.10.11;branch=z9hG4bKe5d6.178378f7.0;received=198.XXX.XXX.XXX
Via: SIP/2.0/UDP 127.0.0.1:12354
;rport=6545;received=198.XXX.YYY.YYY;branch=z9hG4bK-1879-1-3
From: <sip:sip7878_spqa at 64.YYY.YYY.YYY>;tag=1
To: <sip:sip7878_spqa at 64.YYY.YYY.YYY>;tag=as00e32130
Call-ID: 1-1879 at 127.0.0.1
CSeq: 2 REGISTER
User-Agent: CoreDialPBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces
WWW-Authenticate: Digest algorithm=MD5, realm="fe-c7c5-9o.domain.com",
nonce="151e4f60"
Content-Length: 0

Thanks,
Marc
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