Where are the files I downloaded via docker pull stored?

Question

Docker

I want to use Asterisk, I decided to install it through docker, I found this: https://hub.docker.com/r/dougbtv/asterisk/
I made a docker pull, and the instruction contains building it. To make a docker build, is it supposed to have the files downloaded via docker pull?
If I do not understand the instructions correctly, can someone help me with how to use asterisk using docker?) I'm not at all a confident docker user yet

Answer 1

build is necessary only if you take his project from github here , then you will need to git clone https://github.com/dougbtv/docker-asterisk , cd docker-asterisk and then build as written.
If you pull from docker hab , then a pre-built container is used.
Then just docker run -it dougbtv/asterisk and so on.