Hmm..that's interesting. You would guess that the rtpengine binary process shouldn't start connecting ICE candidates once the SIP part is fully negotiated, which should trigger the rtpengine module on the Kamailio to tell rtpengine binary.."ok..you can start associating now..."
On 04/12/2020 13.10, Andrew Chen wrote:
> So from a SIP point of view, the 200 OK should of sent the final
> negotiation of SDP once the client ACK's it right?
The requirement to send an updated offer once ICE has completed with the
final negotiated candidates existed in the original ICE RFC, but I
believe it has been removed in the newer ICE RFC (I'm not 100% sure
about that though). For rtpengine that requirement certainly doesn't
exist and it's happy to negotiate and conclude ICE without a final
updated offer. Also rtpengine itself cannot trigger such an updated
offer since it's not directly in the SIP path, so that would have to be
left up to the clients. So in short, a single offer/answer exchange is
enough to get ICE started and it can complete negotiation out of band
without further signalling.
Cheers
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