Do you still want me to try with DBG mode enabled in sip proxy?

If it's not much fuss to do it, try it. You should not see that "failed to" log anymore, after rtpengine_delete():

rtpengine [rtpengine.c:2792]: select_rtpp_node_old(): rtpengine hash table lookup **failed to** find node for calllen=16 callid=d2016dd39cf7e31c viabranch=

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