This is the contact in your 300:

sip:[email protected]:5060?P-Asserted-Identity=%2216001%22%3Csip%3A16001%3Bverstat%3DTN-Validation-Passed%4010.20.0.2%3A5060%3E

This is the URI in your ACK:

sip:[email protected]:5060

It looks like you're using SIPp which is a pain this way.  Rather than coding 
the URI into the ACK of your SIPp scenario, add rss="true" to the recv line for 
your 300, and then use [next_url] in the template for your ACK mesasge.

Here is an example:  
https://github.com/whosgonna/kamailio_http_async/blob/reply300/sipp/uac_expect_300.xml#L58


Kaufman
Senior Voice Engineer



E: [email protected]







SIP.US Client Support: 800.566.9810  |  SIPTRUNK Client Support: 800.250.6510  
|  Flowroute Client Support: 855.356.9768

[img]<https://www.sip.us/>
[img]<https://www.siptrunk.com/>
[img]<https://www.flowroute.com/>


________________________________
From: Sergio Charrua <[email protected]>
Sent: Monday, December 23, 2024 4:14 PM
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: Alexis Fidalgo <[email protected]>; Ben Kaufman <[email protected]>
Subject: Re: [SR-Users] Re: help on how to get ACK


CAUTION: This email originated from outside the organization. Do not click 
links or open attachments unless you recognize the sender and know the content 
is safe.

Hi !

I have the exact same issue as Alexis. This is my SIP flow (which I believe 
must be very similar, if not identical, to Alexis' ):


            10.20.0.1:5060<http://10.20.0.1:5060/>               
10.20.20.1:5060<http://10.20.20.1:5060/>
        ──────────┬─────────          ──────────┬─────────
19:49:35.432327   │        INVITE (SDP)         │
      +0.007536   │ ──────────────────────────> │
19:49:35.439863   │  100 trying -- your call is │
      +0.006997   │ <────────────────────────── │
19:49:35.446860   │  300 SL - Multiple Choices  │
      +0.001942   │ <────────────────────────── │
19:49:35.448802   │             ACK             │
                  │ ──────────────────────────> │
                  │                             │

INVITE sip:[email protected]:5060<http://sip:[email protected]:5060/> SIP/2.0
Via: SIP/2.0/UDP 10.20.0.1:5060;branch=z9hG4bK-3147164-1-0
From: sipp <sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=1
To: <sip:[email protected]:5060<http://sip:[email protected]:5060/>>
Call-ID: [email protected]<mailto:[email protected]>
CSeq: 1 INVITE
Contact: sip:[email protected]:5060;transport=UDP>
Max-Forwards: 70
Subject: Performance Test
Content-Type: application/sdp
User-Agent: SIPp
Session-Expires: 3600;refresher=uas
Supported: replaces, timer
Content-Length:   129

v=0
o=user1 53655765 2353687637 IN IP4 10.20.0.1
s=-
c=IN IP4 10.20.0.1
t=0 0
m=audio 6000 RTP/AVP 0
a=rtpmap:0 PCMU/8000


SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP 10.20.0.1:5060;branch=z9hG4bK-3147164-1-0
From: sipp <sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=1
To: <sip:[email protected]:5060<http://sip:[email protected]:5060/>>
Call-ID: [email protected]<mailto:[email protected]>
CSeq: 1 INVITE
Server: kamailio (5.8.2 (x86_64/linux))
Content-Length: 0


SIP/2.0 300 - Multiple Choices
Via: SIP/2.0/UDP 10.20.0.1:5060;branch=z9hG4bK-3147164-1-0
From: sipp <sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=1
To: 
<sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=d360f2f6fe5d9cd3912155e609771cc6-f406b8d3
Call-ID: [email protected]<mailto:[email protected]>
CSeq: 1 INVITE
Contact: 
<sip:[email protected]:5060?P-Asserted-Identity=%2216001%22%3Csip%3A16001%3Bverstat%3DTN-Validation-Passed%4010.20.0.2%3A5060%3E<http://sip:[email protected]:5060/?P-Asserted-Identity=%2216001%22%3Csip%3A16001%3Bverstat%3DTN-Validation-Passed%4010.20.0.2%3A5060%3E>>
Server: kamailio (5.8.2 (x86_64/linux))
Content-Length: 0

(The above 300 - Multiple Choice message has a new Contact header, that will be 
used by SBC to redirect the call somewhere else)

ACK sip:[email protected]:5060<http://sip:[email protected]:5060/> SIP/2.0
Via: SIP/2.0/UDP 10.20.0.1:5060;branch=z9hG4bK-3147164-1-3
Max-Forwards: 70
From: <sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=1
To: 
<sip:[email protected]:5060<http://sip:[email protected]:5060/>>;tag=d360f2f6fe5d9cd3912155e609771cc6-f406b8d3
Contact: <sip:[email protected]:5060<http://sip:[email protected]:5060/>>
Call-ID: [email protected]<mailto:[email protected]>
CSeq: 1 ACK
User-Agent: SIPp
Content-Length: 0


From this point, Kamailio will re-send the 300 Multiple Choice message, 
repeating until timeout...




Atenciosamente / Kind Regards / Cordialement / Un saludo,


Sérgio Charrua


On Mon, Dec 23, 2024 at 11:05 PM Ben Kaufman via sr-users 
<[email protected]<mailto:[email protected]>> wrote:
Does your 3xx message have a Contact, and does that Contact URI match the RURI 
in your ACK?


Kaufman
Senior Voice Engineer



E: [email protected]<mailto:[email protected]>







SIP.US<http://sip.us/> Client Support: 800.566.9810  |  SIPTRUNK Client 
Support: 800.250.6510  |  Flowroute Client Support: 855.356.9768

[img]<https://www.sip.us/>
[img]<https://www.siptrunk.com/>
[img]<https://www.flowroute.com/>


________________________________
From: Alexis Fidalgo via sr-users 
<[email protected]<mailto:[email protected]>>
Sent: Monday, December 23, 2024 3:19 PM
To: Kamailio (SER) - Users Mailing List 
<[email protected]<mailto:[email protected]>>
Cc: Alexis Fidalgo <[email protected]<mailto:[email protected]>>
Subject: [SR-Users] help on how to get ACK

CAUTION: This email originated from outside the organization. Do not click 
links or open attachments unless you recognize the sender and know the content 
is safe.


Hello all, moving just a bit aside of the http and async_http.

After all the real useful and interesting thread on that topic what helped me, 
im facing a problem i cant deal with and need a hint at least.

Scenario

INVITE -> Kamailio

on request_route
...
        if(is_method("INVITE")){
                t_newtran();
                http_async_query("http://nuc:8080";, "HTTP_REPLY");
        }
…

Kamailio -> 100 - Trying


then

route[HTTP_REPLY] {
    if ($http_ok) {
        xlog("L_INFO", "route[HTTP_REPLY]: status $http_rs\n");
        xlog("L_INFO", "route[HTTP_REPLY]: body   $http_rb\n");
        t_reply(302,"Redirect");
    } else {
        xlog("L_INFO", "route[HTTP_REPLY]: error  $http_err)\n");
    }
}

Kamailio -> 302 Redirect
ACK -> Kamailio

This last ACK, how can i read it and use it to terminate the transaction? 
because Kamailio keeps transmitting the 302 message 3 more times until the 
transaction is finished by a timer

42(44) DEBUG: tm [t_reply.c:1723]: t_retransmit_reply(): reply retransmitted. 
buf=0x7f4c44f9d680: SIP/2.0 3..., shmem=0x7f4c3fce7900: SIP/2.0 3
42(44) DEBUG: tm [t_reply.c:1723]: t_retransmit_reply(): reply retransmitted. 
buf=0x7f4c44f9d680: SIP/2.0 3..., shmem=0x7f4c3fce7900: SIP/2.0 3
42(44) DEBUG: tm [t_reply.c:1723]: t_retransmit_reply(): reply retransmitted. 
buf=0x7f4c44f9d680: SIP/2.0 3..., shmem=0x7f4c3fce7900: SIP/2.0 3
42(44) DEBUG: tm [timer.c:642]: wait_handler(): finished transaction: 
0x7f4c3fcd35a0 (p:0x7f4c3fad85d0/n:0x7f4c3fad85d0)
42(44) DEBUG: tm [h_table.c:133]: free_cell_helper(): freeing transaction 
0x7f4c3fcd35a0 from timer.c:651


in request_route i have

        if(is_method("ACK")){
                if(!t_check_trans()){
                t_release();
                }
        exit;
        }


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