[SR-Users] 420 Bad Extension error

[Infinicalls Infinicalls]

Hi all,
 I am testing Edge Proxy setup with the example given here :
http://kamailio.org/docs/modules/4.2.x/modules/outbound.html

and I get this error :

U 2016/10/06 09:18:48.331580 10.0.0.4:5060 -> 52.233.25.164:5060
SIP/2.0 420 Bad Extension.
Via: SIP/2.0/UDP
10.1.0.4;branch=z9hG4bK162a.e9f73fe5e52ded1f30801aa00ee2a771.0;
          received=52.233.25.164.
Via: SIP/2.0/UDP
10.114.70.81:1228;received=113.193.149.49;rport=1228;branch=z9h
          G4bKPj3ec7c87e09d6452b9e68e60052cb2651.
From: "User1" <sip:user1 at infinicalls-proxy1.myserver.com>;
     tag=ac1e36aec8bf445bbec8e43cf28e9f48.
To: "User1" <sip:user1 at infinicalls-proxy1.myserver.com>;ta
     g=b27e1a1d33761e85846fc98f5f3a7e58.b172.
Call-ID: a270d285de6145c6b8670b909b104e74.
CSeq: 20149 REGISTER.
Contact: <sip:user1 at 10.114.70.81:1228;ob>;expires=300.
Unsupported: path.
Path: <sip:10.1.0.4;lr>.
Supported: outbound.
P-Registrar-Error: No support for found Path indicated.
Server: kamailio (4.4.3 (x86_64/linux)).
Content-Length: 0.

Both my proxy and registrar are behind NAT.  rtpproxy is installed and started.

I already have modparam("registrar", "use_path", 1) in my registrar.

Any idea what is missing? Thanks.

regards
Ganesh Kumar