[Kamailio-Users] Question about Contact in NAT

[Ricardo Martinez]

Hello list.

I know that probably this questions is more related to the SIP protocol,
but is causing me problems and this is a very supportive list.

I'm using a HT-286 from Grandstream behind NAT.

This is the REGISTER sequence : 

 

U 200.120.46.99:29786 -> 200.100.154.35:5060

REGISTER sip:myproxy.mydomain.net SIP/2.0.

Via: SIP/2.0/UDP 192.168.1.100;branch=z9hG4bKafcb21cb60db91bb.

From:
<sip:5501234567 at myproxy.mydomain.net;user=phone>;tag=478555f337ca8f10.

To: <sip:5501234567 at myproxy.mydomain.net;user=phone>.

Contact: *.

Supported: replaces, timer.

Call-ID: a51e541e3b0f66fd at 192.168.1.100.

CSeq: 100 REGISTER.

Expires: 0.

User-Agent: Grandstream HT287 1.1.0.42 DevId 000b822197fe.

Max-Forwards: 70.

Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE.

Content-Length: 0.

.

 

 

U 200.100.154.35:5060 -> 200.120.46.99:5060

SIP/2.0 100 Trying.

Via: SIP/2.0/UDP
192.168.1.100;branch=z9hG4bKafcb21cb60db91bb;received=200.120.46.99.

From:
<sip:5501234567 at myproxy.mydomain.net;user=phone>;tag=478555f337ca8f10.

To: <sip:5501234567 at myproxy.mydomain.net;user=phone>.

Call-ID: a51e541e3b0f66fd at 192.168.1.100.

CSeq: 100 REGISTER.

Server: Sip EXpress router (0.9.3 (i386/linux)).

Content-Length: 0.

Warning: 392 200.100.154.35:5060 "Noisy feedback tells:  pid=29777
req_src_ip=200.120.46.99 req_src_port=29786
in_uri=sip:myproxy.mydomain.net out_uri=sip:myproxy.mydomain.net
via_cnt==1".

.

 

 

U 200.100.154.35:5060 -> 200.120.46.99:5060

SIP/2.0 401 Unauthorized.

Via: SIP/2.0/UDP
192.168.1.100;branch=z9hG4bKafcb21cb60db91bb;received=200.120.46.99.

From:
<sip:5501234567 at myproxy.mydomain.net;user=phone>;tag=478555f337ca8f10.

To:
<sip:5501234567 at myproxy.mydomain.net;user=phone>;tag=6eb14299de2cc731d17
3c135064daec5.1fe9.

Call-ID: a51e541e3b0f66fd at 192.168.1.100.

CSeq: 100 REGISTER.

WWW-Authenticate: Digest realm="myproxy.mydomain.net",
nonce="4b30e9281c52f640a2713c3011bb835d06005946", qop="auth".

Server: Sip EXpress router (0.9.3 (i386/linux)).

Content-Length: 0.

Warning: 392 200.100.154.35:5060 "Noisy feedback tells:  pid=29777
req_src_ip=200.120.46.99 req_src_port=29786
in_uri=sip:myproxy.mydomain.net out_uri=sip:myproxy.mydomain.net
via_cnt==1".

 

As you can see the initial REGISTER has a Contact header like this : 



Contact: *.

 

 

Is this ok?. Is this ok by RFC?

What does this means?

 

In my cfg file I have : 

 

route[2] {

 

        #
-----------------------------------------------------------------

        # REGISTER Message Handler

        #
-----------------------------------------------------------------

 

        sl_send_reply("100", "Trying");

 

        if (!search("^Contact:\ +\*") && client_nat_test("7")) {

                setflag(6);

                fix_nated_register();

                force_rport();

        };

 

So I think is not matching the regexp "(!search("^Contact:\ +\*")"
therefore is not fixing the contact.

 

Any ideas?

 

Ricardo.-

 

 

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