I just wanted to point that I have a WIP 4.2.X https://github.com/linuxmaniac/kamailio/tree/vseva/nathelper_socket_filter that we use (4.1.X) in order to share usrloc.location between proxies, using dbmode=3, splitting the work of natpinger between them filtering the users by socket.

So nathelper has a new module parameter filter_socket to control this behavior

Maybe we can get to common point to deal with different scenarios

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