Thank you to all for the tips...
Regards
---
I'm SoCIaL, MayBe
El 27/01/2022 a las 6:39 p. m., Sergiu Pojoga escribió:
You would achieve this in a failure route, detecting the 488|415
negative replies then resuming the branch with a different SDP profile.
However, as others have said already, not all UAs will accept this
"hack". Some will consider the new branch with a CSeq NOT incrementing
as retransmission - and reject it with something like "482 Merged
Request".
https://tools.ietf.org/html/rfc3261#section-8.2.2.2
8.2.2.2 Merged Requests
If the request has no tag in the To header field, the UAS core MUST
check the request against ongoing transactions. If the From tag,
Call-ID, and CSeq exactly match those associated with an ongoing
transaction, but the request does not match that transaction (based
on the matching rules in Section 17.2.3), the UAS core SHOULD
generate a 482 (Loop Detected) response and pass it to the server
transaction.
Regards,
--Sergiu
On Thu, Jan 27, 2022 at 6:26 PM Marrold <[email protected]> wrote:
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
>>
>>
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