[OpenSER-Users] Handle 302 Moved Temporarily

[Dmitry Lyubimkov]

We need process 302 redirection Message in our OpenSER (ver 1.3) script.
we use failure_route

failure_route[1]                 
{

    append_hf("Transfer-code: $T_reply_code\r\n");
    if t_check_status("(302)|(301)"){
        append_hf("Original-URI: $ru\r\n");
        get_redirects("*");
       rewritehostport("172.16.2.6");
#       append_branch();
        route(1);
   } else 
    if t_check_status("(408)|(486)"){
        rewritehostport("172.16.2.6");
        append_branch();
        route(1);
    };
}

All fails with 4xx code (Timeout, Busy) work right. OpenSER send them to
asterisk (172.16.2.6). But we cannot do the same with 301 and 302 code,
because there is a header Contact in their replies. And we need to change
our URI according this field.
Using Tcpdump I get some diagnostic:
Invite to UA:

18:48:31.898163 IP 78.36.60.131.sip > 172.16.76.4.53568: SIP, length: 1258
E..... at .@...N$<...L.... at ....INVITE
sip:loft at 172.16.76.4:53568;rinstance=87e2d8d91648c3bf SIP/2.0
Record-Route: <sip:78.36.60.131;lr;ftag=2D551EE4-2538;nat=yes>
Via: SIP/2.0/UDP voapp.ru:5060;branch=z9hG4bK8b81.6f656603.0
Via: SIP/2.0/UDP  78.36.60.129:5060;rport=52061;x-route-tag="tgrp:m200"
From: <sip:78142722856 at 78.36.60.129>;tag=2D551EE4-2538
To: <sip:78142599298 at 78.36.60.131>
Date: Fri, 04 Jul 2008 14:39:48 GMT
Call-ID: E338E8F0-490D11DD-834CC831-1B0A3D9F at 78.36.60.129
Supported: timer,100rel
Min-SE:  1800
Cisco-Guid: 3812117704-1225593309-2202650673-453655967
User-Agent: Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,
NOTIFY, INFO
CSeq: 101 INVITE
Max-Forwards: 5
Timestamp: 1215182388
Contact: <sip:78142722856 at 78.36.60.129:5060>
Expires: 180
Allow-Events: telephone-event
Content-Type: application/sdp
Content-Length: 375

Reply witn 302 code:
18:48:32.019255 IP 172.16.76.4.53568 > 78.36.60.131.sip: SIP, length: 474
E...\...}.]+..L.N$<.. at ....
.SIP/2.0 302 Moved Temporarily
Via: SIP/2.0/UDP
voapp.ru:5060;branch=z9hG4bK8b81.6f656603.0;received=78.36.60.131
Via: SIP/2.0/UDP  78.36.60.129:5060;rport=52061;x-route-tag="tgrp:m200"
Contact: <sip:78142705353 at voapp.ru>
To: <sip:78142599298 at 78.36.60.131>;tag=e3040a33
From: <sip:78142722856 at 78.36.60.129>;tag=2D551EE4-2538
Call-ID: E338E8F0-490D11DD-834CC831-1B0A3D9F at 78.36.60.129
CSeq: 101 INVITE
User-Agent: X-Lite release 1011s stamp 41150
Content-Length: 0

Our acknoledgement:
18:48:32.019395 IP 78.36.60.131.sip > 172.16.76.4.53568: SIP, length: 395
E..... at .@..yN$<...L.... at ...`ACK
sip:loft at 172.16.76.4:53568;rinstance=87e2d8d91648c3bf SIP/2.0
Via: SIP/2.0/UDP voapp.ru:5060;branch=z9hG4bK8b81.6f656603.0
From: <sip:78142722856 at 78.36.60.129>;tag=2D551EE4-2538
Call-ID: E338E8F0-490D11DD-834CC831-1B0A3D9F at 78.36.60.129
To: <sip:78142599298 at 78.36.60.131>;tag=e3040a33
CSeq: 101 ACK
Max-Forwards: 70
User-Agent: OpenSER (1.3.1-notls (i386/linux))
Content-Length: 0

And new Invite:
18:48:32.019762 IP 78.36.60.131.sip > 172.16.76.4.53568: SIP, length: 1327
E..K.. at .@...N$<...L.... at .7..INVITE sip:78142705353 at 172.16.76.4:53568 SIP/2.0
Record-Route: <sip:78.36.60.131;lr;ftag=2D551EE4-2538;nat=yes>
Via: SIP/2.0/UDP voapp.ru:5060;branch=z9hG4bK8b81.6f656603.1
Via: SIP/2.0/UDP  78.36.60.129:5060;rport=52061;x-route-tag="tgrp:m200"
From: <sip:78142722856 at 78.36.60.129>;tag=2D551EE4-2538
To: <sip:78142599298 at 78.36.60.131>
Date: Fri, 04 Jul 2008 14:39:48 GMT
Call-ID: E338E8F0-490D11DD-834CC831-1B0A3D9F at 78.36.60.129
Supported: timer,100rel
Min-SE:  1800
Cisco-Guid: 3812117704-1225593309-2202650673-453655967
User-Agent: Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,
NOTIFY, INFO
CSeq: 101 INVITE
Max-Forwards: 5
Timestamp: 1215182388
Contact: <sip:78142722856 at 78.36.60.129:5060>
Expires: 180
Allow-Events: telephone-event
Content-Type: application/sdp
Content-Length: 375
Transfer-code: 302
Original-URI: sip:loft at 172.16.76.4:53568;rinstance=87e2d8d91648c3bf

But why sip:78142705353 at 172.16.76.4:53568?
Why not 172.16.2.6 (rewritehostport("172.16.2.6");) or
sip:78142705353 at voapp.ru (Contact: <sip:78142705353 at voapp.ru>)?

Where is error? I need to sent all 3xx redirects to dedicated server but I
also need to get Contact header from UA reply and put it in outgoung
message. What commands must I use? Can anybody help me and get fragment of
openser script?

Thx
Dmitry