GE 800-EFM - Manual (Page 39)

Your Music on Hold Adapter must be used in a system of at least
two system telephones in order for it to work. It will not work if you
only have one system telephone installed.
Note: Users of equipment that rebroadcasts copyrighted music or
other material may be required to obtain a license from a third party
such as ASCAP or BMI.
Usage Notes
35
Using Your Music on Hold Adapter
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