how can i modify package name of decompiled apk?

I have decompiled a voip calling apk file with Apktool and i tried to change itz package name… But i getting error that unfortunately app stopped`…

What i did that search the package name inside the all files (root dir)and replace every occurrence with new package name by with notepad ++…

Here problem is that app using to communicate their server by with same as package name so it would cause error ” unfortunately stoped!!! “

How can i replace only that package name without effecting other name that have same package name
Any app available. for package renaming?
Thanks in advance

Source: android

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