Not if you don't have any multi-line analog phones or modules - such as BIS-10 type. I assume you are getting a Magix processor or at least a CKE4 to load the Magix R4.0 software.
Then you should have no problem. Don't forget to use WinSPM to convert your system programming back-up from the old Legend processor version to the new Magix processor version.
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