Hi, Did you try to lookup the dialog[1] before calling dlg_req_within()?
[1] https://kamailio.org/docs/modules/devel/modules/dialog.html#dialog.f.dlg_get Thanks, Carsten -- Schöne Grüße aus Hamburg, dem Tor zur Welt, Carsten Bock Baron-Voght-Str. 128a I 22607 Hamburg I Germany T +49 179 2021244 I [email protected] LinkedIn: https://www.linkedin.com/in/carstenbock/ Alex Balashov via sr-users <[email protected]> schrieb am Do., 14. Nov. 2024, 21:44: > Hi, > > I am trying to use dlg_req_within() for a 3pcc-style call setup, to set up > media via a reinvite: > > 1. Store original SDP offer from caller in $dlg_var()s; > > 2. Later, after e2e ACK is processed for initial INVITE transaction, send > reinvite to callee using dlg_req_within(). I call rtpengine_offer() and > feed it the original SDP offer (via read_sdp_pv modparam), and take the > RTPEngine-transformed SDP and feed that to dlg_req_within(): > > dlg_req_within("callee", "INVITE", "application/sdp", > "$var(sdp_from_rtpengine)"); > > 3. I have found that event_route[tm:local-response] does not allow me to > capture the 200 OK / SDP answer to this reinvite; it is internally absorbed. > > However, it is possible to arm an onreply_route in > event_route[tm:local-request], to receive the 200 OK: > > event_route[tm:local-request] { > if(method == "INVITE" && has_body("application/sdp")) > t_on_reply("REINVITE_REPLY"); > } > > 4. My intent is for this reinvite reply handler to set off a reinvite to > the caller side: > > onreply_route[REINVITE_REPLY] { > if(method == "INVITE" && has_body("application/sdp") && > t_check_status("200")) { > ... > $var(rtpengine_use_this_sdp) = $rb; > rtpengine_answer("..."); > dlg_req_within("caller", "INVITE", "application/sdp", > "$var(sdp_from_rtpengine)"); > } > > This ensures proper relay symmetry. Otherwise, the caller will continue to > send RTP to the previous upstream endpoint of the call, prior to any > reinvite. > > However, dlg_req_within() doesn't work in this later context, even though > the documentation says it can be used from ANY_ROUTE. Kamailio doesn't > complain, there is no error. It just doesn't initiate a reinvite to the > caller. > > I considered the possibility that this may be because the calling scope is > that of a pending reinvite transaction to the callee, but there is no > obvious way to defer that into the future. If I send it to an async task > worker, the transaction scope required for dlg_req_within() to know which > dialog it's operating on will be lost. > > Any ideas appreciated, and thank you in advance! > > -- Alex > > -- > Alex Balashov > Principal Consultant > Evariste Systems LLC > Web: https://evaristesys.com > Tel: +1-706-510-6800 > > __________________________________________________________ > Kamailio - Users Mailing List - Non Commercial Discussions -- > [email protected] > To unsubscribe send an email to [email protected] > Important: keep the mailing list in the recipients, do not reply only to > the sender! >
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