[OpenSER-Users] newbie question on NAT

[mark morreny]

Hi,

I am working on configuring RTP Proxy.  The problem I am having is that
Openser will use rtp proxy to serve the rtp session even when both UAs and
Openser are withing the same LAN.

Here is the openser.cfg I used:

    if (nat_uac_test("19")) {
        if (method=="REGISTER") {

                fix_nated_register();
        } else {
                fix_nated_contact();
        };
        setflag(5);
    };

Hre is a INVITE SIP packet from one of the UA:

U 192.168.1.101:5062 -> 192.168.1.104:5060
  INVITE sip:1006 at 192.168.1.104 <sip%3A1006 at 192.168.1.104> SIP/2.0..Via:
SIP/2.0/UDP 192.168.1.101:5062;branch=z9hG4b
  K-220120f9..From: "1005"
<sip:1005 at 192.168.1.104<sip%3A1005 at 192.168.1.104>>;tag=490c5d623d5acbf5o0..To:
"1006" <si
  p:1006 at 192.168.1.104 <p%3A1006 at 192.168.1.104>>..Call-ID:
3e5720e1-bf774681 at 192.168.1.101..CSeq: 102 INVITE..Max-F
  orwards: 70..Proxy-Authorization: Digest username="1005",realm="
192.168.1.104",nonce="48
  4b3b51ea052f45482ef4fd26f00a14239c3465",uri="sip:1006 at 192.168.1.104<sip%3A1006 at 192.168.1.104>
",algorithm=MD5,respo

nse="d46ea7cd9781b9a1493e6eaf7b978086",qop=auth,nc=00000001,cnonce="676aa6d8"..Contact:
  "1005" <sip:1005 at 192.168.1.101:5062>..Expires: 240..User-Agent:
Sipura/SPA921-4.1.10(b).
  .Content-Length: 401..Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY,
OPTIONS, REFER..Con
  tent-Type: application/sdp....v=0..o=- 26093424 26093424 IN IP4
192.168.1.101..s=-..c=IN
   IP4 192.168.1.101..t=0 0..m=audio 16474 RTP/AVP 0 2 4 8 18 96 97 98
101..a=rtpmap:0 PCM
  U/8000..a=rtpmap:2 G726-32/8000..a=rtpmap:4 G723/8000..a=rtpmap:8
PCMA/8000..a=rtpmap:18
   G729a/8000..a=rtpmap:96 G726-40/8000..a=rtpmap:97
G726-24/8000..a=rtpmap:98 G726-16/800
  0..a=rtpmap:101 telephone-event/8000..a=fmtp:101
0-15..a=ptime:30..a=sendrecv..
#

I even tested with nat_uac_test("1") and nat_uac_test("2") and
nat_uac_test("16") seperately and found that nat_uac_test("1") is return
true, meaning that Openser detects a RFC1918 address in the Contact field.

If Openser is in the same LAN as the UA, then no rtp proxy should be
utilized.   Could someone please help me out to configure rtp proxy
correctly?

I would appreciate any help in solving this problem.

Regards,
Mark
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