[OpenSIPS-Users] Working around a broken NAT

[James Lamanna]

Hi,
Is there a good way to work around a broken NAT?
I have a customer who is receiving one-way inbound audio (outbound is fine).

Here's what a REGISTER packet looks like:

U public.ip:9241 -> opensips.ip:5060
 REGISTER sip:registrar SIP/2.0..Via: SIP/2.0/UDP
public.ip:9241;branch=z9hG4bK-6d65fdc0..From: "0882"
<sip:0882 at registrar.warp2biz.com>;tag=98193b5f9af29c75o0..To:
"626-628-0882" <sip:0882 at registrar>..Call-ID: 1fc928db-41d9
  2937 at 192.168.1.71..CSeq: 50366 REGISTER..Max-Forwards: 70..Contact:
"0882" <sip:0882 at public.ip:9241>;expires=3500..User
  -Agent: Linksys/SPA942-6.1.3(a)-000e083c54b9..Content-Length:
0..Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS,
REFER..Supporte
  d: replaces....

As you can see, all nat_uac_test()s would fail, and nothing is stored
in the received line of the location database.
Is there another way to work around this, or do I just have to tell
them to fix their router?

Thanks.

-- James