[Serusers] Nat_uac_test failing with ATA v3.2 behind NAT, ATA v3.1 works

Hi Serusers, I have 2 ATAs, one is V3.1 and one is V3.2, they are both behind NAT and are behaving differently when registering. With 3.2, the nat_uac_test does not apparently detect it is behind NAT and leaves the flag at 0 in the location table. V3.1 works fine. I can see why nat_uac_test() may be failing, because the ATA seems to have auto-magically detected its public IP and is using it in the via: header, thus receive!=via test fails! Also the contact has the public IP, so the RFC1813 test fails. I have not configured the NAT IP or server in the ATA as the NAT public IP is dynamic. Although the v3.2 ATA seems to have figured out its public IP, it still uses its private IP in the INVITE sdp c= headers, so we get no media. And because the nat flag is 0, the rtpproxy doesn't kick in and fix things. Notice the call-id of the register message includes the private ip. Anyone familiar with ATA firmware versions and features know the magic incarnation to shut off the "auto-detect public IP", ahem, "feature" in v3.2? Or any other suggestions for how to make nat_uac_test() get a positive when it gets one of these smart REGISTERs from behind NAT? Im running the old version of SER 0.8.12 still where nat_uac_test only has 1 2 or 3 options, not the new one that has "19", would that make a difference, upgrading to v0.9? Here are the ngreps of REGISTERs from the 2 versions: (public Ips masked) V3.1 works fine, nat_uac_test results in flag 1 in location table, rtpproxy works fine U <nat1 pub ip>:49121 -> <pub ip of ser>:5060 REGISTER sip:sip.mycompany.com SIP/2.0..Via: SIP/2.0/UDP 192.168.0.11: 5060..From: <sip:20210@sip.mycompany.com;user=phone>;tag=933299358..To : <sip:20210@sip.mycomapny.com;user=phone>..Call-ID: 4033019825(a)192.16 8.0.11..CSeq: 1 REGISTER..Contact: <sip:20210@192.168.0.11:5060;user=phone; transport=udp>;expires=3600..User-Agent: Cisco ATA 186 v3.1.0 atasip (0402 11A)..Content-Length: 0.... And from ata with v3.2 U <pub ip of nat2>:5060 -> <pub ip of ser>:5060 REGISTER sip:sip.mycompany.com SIP/2.0..Via: SIP/2.0/UDP <pub ip of nat2> :5060;branch=z9hG4bK1c6d78542c385f5e..From: <sip:202111@sip.mycompany.com ;user=phone>;tag=2453464613..To: <sip:202111@sip.mycomapny.com ;user=phone>..Call-ID: 1193202309@172.16.1.100..CSeq: 1 REGISTER..Con tact: <sip:202111@<pub ip of nat2>:5060;user=phone;transport=udp>;expire s=3600..User-Agent: Cisco ATA 186 v3.2.0 atasip (041111A)..Content-Length: 0.... Thx in advance, Jon