[SR-Users] NO_DTLS_FINGERPRINT when calling from webrtc to webrtc client

[Paweł Sternal]

Thanks Daniel, you save my day :-) Two rtpengine solves my problem and
works perfect. This solution also adds me the possibility to record calls,
when between two rtpengine instances I will put rtpproxy.

Regards,
Pawel

2014-09-17 9:35 GMT+02:00 Daniel-Constantin Mierla <miconda at gmail.com>:

> Hello,
>
> I would add the RTP-WebRTC gateway between SIP Kamailio and SIP UAC, from
> resources point of view, it is the only leg that needs
> encryption/decryption.
>
> Otherwise, you can try to work with two rtpengine instances (sets) in WS
> Kamailio, one to use for ws client to proxy and the other one for the leg
> from proxy to ws client. It will be a communication between them with
> classic rtp, both having towards ws client webrtc. It has the drawback of
> decryption and encryption done two times for the same call. You would need
> to add rtpengine set id in record-route to be able to handle properly the
> re-INVITE, BYE, etc.
>
> Another option that I would use is to send a negative reply from SIP
> kamailio, catch that in failure_route in WS Kamailio and engace there the
> rtpengine with proper flags. E.g., you assume it is going to be
> webrtc-to-webrtc, so no encryption/decryption added first time invite comes
> from WS client. You forward to SIP kamailio, which based on location, if it
> discovers that the callee is classic SIP-RTP, will send a 4xx back to WS
> Kamailio -- you end previous rtpengine session and engage it again with new
> flags (use branch route for managing rtpengine -- like it is done in
> default kamailio.cfg for rtpproxy).
>
> Cheers,
> Daniel
>
>
> On 15/09/14 20:30, Paweł Sternal wrote:
>
>> Hi. Another topic about WebRTC, websockets with kamailio and rtpengine ;-)
>>
>> My problem is how to distinguish a call to WS UAC and how to SIP UAC in
>> scenarios:
>>
>> 1) WS client1 -> WS kamailio -> SIP kamailio -> SIP UAC
>>
>> 2) WS client1 -> WS kamailio -> SIP kamailio -> WS kamailio -> WS client2
>>
>> WS kamailio is a proxy, SIP kamailio is a registrar
>>
>> When "WS client1" is calling to "123123" WS kamailio doesn't know if
>> "123123" was registered from "WS client2" or from SIP UAC.
>>
>> I have in this case rtpengine_manage("....... RTP/AVP"), but when INVITE
>> is returned to WS kamailio? RTP/SAVPF?
>>
>> Probably it is obvious, however...
>>
>> When WS client2 reply with 200OK, rtpengine_manage("..... ICE=force") to
>> WS client1 SDP is sent without a:fingerprint. sipml5 dumps warning:
>>
>> message: "Could not negotiate answer SDP; cause = NO_DTLS_FINGERPRINT
>>
>> I tried different combinations... and I'm stuck :/
>>
>> Regards
>>
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>>
>
> --
> Daniel-Constantin Mierla
> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
> Sep 22-25, Berlin, Germany
>
>
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