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You could try using something like this https://hub.docker.com/r/nicolaka/netshoot. To capture the traffic from a docker container you need to connect to it's network namespace so you can tap into the docker container network traffic. To accomplish that you could run the netshoot container. You can run something like docker run -it --rm --net container:container_name nicolaka/netshoot tcpdump. That command will bind the netshoot container to the network namespace of the container that is running your VoIP service and through tcpdump it will capture all of it's traffic. Hope that helps.
