Hi, Unfortunately in my experience "Opportunistic SRTP" support is broken in many UAs. There are (at least) two ways of doing it covered indirectly in RFC3264 <https://tools.ietf.org/html/rfc3264> and the second explicitly in RFC8643 <https://www.rfc-editor.org/rfc/rfc8643.html> and devices seem to handle them differently. I've seen end devices that *can *support SRTP choose to use standard RTP when offered the wrong type of SDP body.
One thing I considered (but haven't tested so far) is using a late offer to discover what format the end device expects before sending an offer, but that might cause interop problems of its own. Cheers On Thu, Jan 27, 2022 at 10:54 PM Social Boh <[email protected]> wrote: > I can examine the request but how examine the answer if is a Error? > Using a failure route? > > Regards > > --- > I'm SoCIaL, MayBe > > El 27/01/2022 a las 5:39 p. m., Alex Balashov escribió: > > Does an examination of the SDP offer and answer respectively not divine > the issue? > > > >> On Jan 27, 2022, at 5:35 PM, Social Boh <[email protected]> wrote: > >> > >> I'm trying to configure Kamailio to permit communication between > devices: > >> > >> some use TLS and SRTP > >> > >> some UDP and RTP > >> > >> with RTPEngine in the middle. > >> > >> A priori I don't know if the device support SRTP or RTP so in the > routing I have to detect on the fly how to act. The problem is this: > >> > >> Call from RTP to SRTP device: 488 Not Acceptable here > >> > >> Call from SRTP to RTP device: 415 Unsupported Media Type > >> > >> Any hint? > >> > >> Thank you > >> > >> Regards > >> > >> -- > >> --- > >> I'm SoCIaL, MayBe > >> > >> > >> __________________________________________________________ > >> Kamailio - Users Mailing List - Non Commercial Discussions > >> * [email protected] > >> Important: keep the mailing list in the recipients, do not reply only > to the sender! > >> Edit mailing list options or unsubscribe: > >> * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users > > __________________________________________________________ > Kamailio - Users Mailing List - Non Commercial Discussions > * [email protected] > Important: keep the mailing list in the recipients, do not reply only to > the sender! > Edit mailing list options or unsubscribe: > * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >
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