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cd OpenACD
git remote add upstream githttps://github.com/VagabondOpenACD/OpenACD.git
git fetch upstream
git branch -t upstream remotes/upstream/master
git checkout master
git merge upstream

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So what you've done by following these steps is to create a way to track and pull in changes from upstream for a given submodule. The sipXecs project has no idea where these changes come from and it doesn't need to care. As such, multiple developers can perform these steps whenever the need arises.