[SR-Users] Re: How to invoke RTPengine for re-Invite 200 OK within dialog

Thank you sir for the prompt response, it helped me resolve the issue I was facing.

Regards, Shah Hussain

________________________________ From: Alex Balashov abalashov@evaristesys.com Sent: Monday, August 26, 2024 6:29 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Cc: Shah Hussain Khattak shahhusayn@msn.com Subject: Re: [SR-Users] How to invoke RTPengine for re-Invite 200 OK within dialog

Hello,

You would invoke it the same way as with any other kind of INVITE: arm an onreply_route using t_on_reply():

request_route { ...

t_on_reply("MAIN_REPLY");

if(!t_relay()) sl_reply_error(); }

onreply_route[MAIN_REPLY] { if(t_check_status("200") && sdp_content()) rtpengine_manage("replace-origin replace-session-connection"); }

-- Alex

On Aug 26, 2024, at 6:08 AM, Shah Hussain Khattak via sr-users sr-users@lists.kamailio.org wrote:

Hello Experts,

I need your advice on the following issue if you can kindly help.

I am working on a hold call flow:

UA - > Kamailio (RTP Engine) - > FS

initial call establishes fine, RTP engine is invoked and SDP media IP is modified correctly. Then

• I am receiving a hold re-invite with a send-only
• I see Kamailio is changing the media IP in the SDP (with my RTP engine IP) when it sends the Invite to my core FS server.
• FS sends 200 OK with a=recvonly
• Kamailio relays the message as it is to the other leg.

can someone advise me, on how can I invoke rtpengine at step 4, so the SDP is sent with my media server IP in the 200 OK?

--- 200 OK from FS ----

SIP/2.0 200 OK Via: SIP/2.0/UDP 13.54.01.02:5060;branch=z9hG4bKd2e8.8a573af8d927f67c1db4550676f8be88.0;i=1 Via: SIP/2.0/TCP 192.168.10.117:51280;received=218.33.01.02;rport=51280;branch=z9hG4bKPj7d1d8968830d4ed3922eec7da7cdc17c;alias Record-Route: sip:13.54.01.02:5060;r2=on;lr=on Record-Route: sip:13.54.01.02;transport=tcp;r2=on;lr=on From: sip:0403225908@trunk.xyz.corp;tag=6a180ffa7f824972a2c59ba47f293acb To: sip:+61285038000@trunk.xyz.corp;tag=DZrpcpgS1BDKF Call-ID: 4154062196634c34a2dbcb6b612bf44c CSeq: 12263 INVITE Contact: sip:+61285038000@54.88.54.88:5060;transport=udp User-Agent: UserAgentX/v1.0 Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY Require: timer Supported: timer, path, replaces Session-Expires: 1800;refresher=uac Content-Type: application/sdp Content-Disposition: session Content-Length: 266

v=0 o=FreeSWITCH 1724635755 1724635757 IN IP4 54.88.54.88 s=FreeSWITCH c=IN IP4 54.88.54.88 t=0 0 m=audio 21202 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=recvonly a=ptime:20 a=rtcp:21203 IN IP4 54.88.54.88

--- 200 OK relayed towards the UA ----

2024/08/26 17:22:39.923639 172.16.8.126:5060 -> 218.33.78.33:51280 SIP/2.0 200 OK Via: SIP/2.0/TCP 192.168.10.117:51280;received=218.33.01.02;rport=51280;branch=z9hG4bKPj7d1d8968830d4ed3922eec7da7cdc17c;alias Record-Route: sip:13.54.01.02:5060;r2=on;lr=on Record-Route: sip:13.54.01.02;transport=tcp;r2=on;lr=on From: sip:0403225908@trunk.xyz.corp;tag=6a180ffa7f824972a2c59ba47f293acb To: sip:+61285038000@trunk.xyz.corp;tag=DZrpcpgS1BDKF Call-ID: 4154062196634c34a2dbcb6b612bf44c CSeq: 12263 INVITE Contact: sip:+61285038000@54.88.54.88:5060;transport=udp User-Agent: UserAgentX/v1.0 Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY Require: timer Supported: timer, path, replaces Session-Expires: 1800;refresher=uac Content-Type: application/sdp Content-Disposition: session Content-Length: 266

v=0 o=FreeSWITCH 1724635755 1724635757 IN IP4 54.88.54.88 s=FreeSWITCH c=IN IP4 54.88.54.88 t=0 0 m=audio 21202 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=recvonly a=ptime:20 a=rtcp:21203 IN IP4 54.88.54.88

my configs for within dialog route:

#####

route[WITHINDLG] {

append_hf("X-Test-Header: route_WITHINDLG\r\n");

if (has_totag()) { if (loose_route()) {

        if (is_method("BYE")) {
            setflag(FLT_ACC); # do accounting ...
            setflag(FLT_ACCFAILED); # ... even if the transaction fails
        }

        if (is_method("ACK")) {
            xlog("L_INFO", "Relaying ACK\n");
        }


    if (is_method("INVITE|UPDATE")) {
        if (has_body("application/sdp") && search_body("m=image") && search_body("T38")) {
           xlog("L_INFO", "T.38 re-INVITE detected, skipping rtpengine invocation\n");
        } else {
           xlog("L_INFO", "Non-T.38 INVITE detected, invoking rtpengine\n");

           rtpengine_manage("replace-origin replace-session-connection");
        }
      }


      route(RELAY);

    } else {
        if (is_method("SUBSCRIBE") && uri == myself) {
            route(PRESENCE);
            exit;
        }
        if (is_method("ACK")) {
            if (t_check_trans()) {
                t_relay();
                exit;
            } else {
                exit;
            }
        }
        sl_send_reply("404","Not here");
    }
    exit;
}

}

#####

looking forward to your usual guidance.

Thank you!

Regards, Shah __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:

-- Alex Balashov Principal Consultant Evariste Systems LLC Web: https://evaristesys.com Tel: +1-706-510-6800