I would not like a dependency on dialog module, it is quite common to run rtp relay on edge proxy which is typically more or less a lightweight load balancer -- dialog management on those nodes will add a lot of overhead.

Fallback to hasing callid after a restart seams reasonable for me (giving the current behaviour).

For spiralled calls, iirc, there is an option to provide via branch to rtpproxy/rtpengine, but this is independent of selecting what rtpproxy/rtpengine to use.

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