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Example: Updating OpenACD:

step Step 1. From your source root in the sipXecs source tree, select the proper source branch and run the following:

cd OpenACD
git remote add upstream git://github.com/Vagabond/OpenACD.git
git fetch 
git checkout -b upstream upstream/master
git checkout master
git merge upstream

step 2Step 2. Change read-only git url to read/write. NOTE: For this step you need sipXecs commit rights.
Edit OpenACD/.git/config and change

[remote "origin"]
        fetch = +refs/heads/*:refs/remotes/origin/*
        url = git://github.com/dhubler/OpenACD.git

to

[remote "origin"]
        fetch = +refs/heads/*:refs/remotes/origin/*
        url = git@github.com:dhubler/OpenACD.git

Step 3. You've updated your local copy, but now you need to commit your changes to sipXecs project. These are the same general steps one would follow for submitting any fix to git submodules. This is a two step process: first pushing the changes to the git submodule itself then updating sipXecs to point to that new revision in the submodule.

git push origin master
cd ..
git commit -m 'Updated lastest OpenACD' OpenACD

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