Would appreciate your input into where to look further to explore my options and would be good to learn your experience with the following. 

There are many active-active kamailio nodes behind tcp load balancer. On the same VM with each Kamailio there is an instance of RTPEngine to manage Media/Transcoding/Etc for that Kamailio. This scales UP easily - new nodes just added behind tcp load balancer. To be able to scale down and/or update node configuration - I'd like to be able to drain sessions/calls properly and pass any active calls from current Kamailio and RTPEngine to other nodes.

DMQ is not yet in place, although it's planned.

What would be proper ways of migrating RTP sessions to other RTPEngines? Caveats? 

Also wonder how properly a tcp/tls based SIP session can be passed to another Kamailio?

Thank you in advance for your input. 

Evgenii Buchnev