[OpenSIPS-Users] Stubborn ALG always append wrong "Route" header in BYE message

[DangVinh Nguyen]

Dear all

I have a opensips/mediaproxy,run a basic script. Opensips/mediaproxy using
public IP address, client behind NAT ( maybe Cisco PIX. i do not control the
NAT box)

Everything works fine if i force opensips not listen on 5060, and clients
mus not listen on port 5060 UDP.

If one client listen on port 5060, something wrong happens.
The NAT box do some very nasty things.

With fix_nated_contact and fix_contact, fix_nated_register, i can manage to
place a call OK.

But I can not fix call tear down request.
Here's a sip log when 02 client behind the same NAT box tried to call ok,
then client_13 tried to tear down the call to client_12

UDP, client_13_WAN_IP:port  -> opensipPublicIP:5080

BYE sip:opensipsIP:5080;ftag=59fbbd9a;lr=on;did=f12.8b280607
SIP/2.0..Via: SIP/2.0/UDP 10.0.0.115:5060;rport;branch=z9hG4bKde05e887e5..
From: <sip:13 at opensipsIP:5080>;tag=0c46ffef..
To: 12" <sip:12 at opensipsIP:5080>;tag=59fbbd9a..Call-ID:
21a6b8b248a7bf607d055ce36b157b34 at 10.0.0.96..
Route: <sip:12 at 10.0.0.96:5060>..
Contact:<sip:13 at 10.0.0.115:5060>..
CSeq: 801 BYE..
Max-Forwards: 70..
User-Agent: CM5K  (709190)..
Content-Length: 0..


And here's opensips debug message

 DBG:rr:after_strict: Next hop: 'sip:12 at 10.0.0.96:5060' is strict router

And then opensips send BYE message to 10.0.0.96:5060, not to WANIP:Port of
the destination client. Ofcourse the destination cound not receive BYE
message, call tear down failed.

I tried to remove_hf, subst_uri, replace... the BYE message just after it
enter routing script, but nothing works.

Please suggest me one way to get rid of this NAT box. Or the only solution
is change both ports on opensips and clients?


Regards
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