Hello,

Sorry, I forgot to mention that, between the call of the two webrtc clients, there is a B2BUA that only supports SIP UDP and RTP, so I need to use rtpengine to translate from DTLS/SRTP to RTP.

I will try to make a call between the two webrtc clients and only use kamailio without rtpengine to limit the issue.

Os melhores cumprimentos / Best regards,

José Lopes
Research and Development Technician

Phone: +351 256 370 980

Email: jose.lopes@itcenter.com.pt

On Tue, May 5, 2020 at 5:15 PM Juha Heinanen <jh@tutpro.com> wrote:

This 488 think reminds me that SIP over webrtc is broken.

Webrtc UAS (at least JsSIP) cannot issue 488 before the UAS has started
to ring. It is very frustrating for the callee to get such a spam ring.

RFC3261 section "8.2 UAS Behavior" tells:

Note that request processing is atomic. If a request is accepted,
all state changes associated with it MUST be performed. If it is
rejected, all state changes MUST NOT be performed.

So it is against the standard to issue 180 and after that reject the
request with 488.

-- Juha

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