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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