When I hit handsfree button it says it is muted cant figure out how to un-mute the phone

Must have hit a mute button, try to locate that button. If no mute button then your phone might be broken.

Intercom button/s provide dial tone when they are pressed. They are required to call other phones on your system.
Sounds like your button is stuck or issue with the motherboard.

familirize with devices user manual whether has feature functions requested. Second, ascertain that device was least malfunctioning since acquired. normally, familirising with innovative devices makes expertise in functionality.

There is a speaker test you can do. Press the feature button then on the dial pad press 805 followed by the # key or the next key until you see speaker test in the display. Press the test key or the hold button to start the test. You should hear a page tone at maximum volume. Press any button to end the test, the volume will return to its previous level.

The phone is mute by pressing the handsfree/mute button(bottom left button). sometimes the button labels do not match the feature that is programmed for the button. Press feature * 0 and any button to see what feature is programmed on the button.

If you have a hansfree/ mute button (green button on the lower right) pressing the handsfree a second time mutes the mic. pressing the handsfree button again activates the mic

The handsfree.mute key is turned off by the release (Rls) key.

sounds as if you will need your vendor to program your phone and others that need be to have Handsfree/mute capabilities.. i assume since you can not mute then you can not place your phone on Handsfree either.

The button for handsfree is the same button for Mute.
So when you are on the handsfree call, press the handsfree button again and the call is muted on your side.

To talk again, press the handsfree button to un-mute the call, then press it again to mute your call.

To hang up press the orange RLS button.

Call your muted A747 from another phone.
Answer the call.
On your A747 select Options with the top left button.
Select the first entry, Mute/Unmute.
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This fixed the same problem on my A747. Before doing this the Mute/Unmute had no effect. After doing the repair, all is OK.

5104,

The button that mutes the speakerphone is the mic/HFAI key located above your speaker button. The mic mute feature works while using the speaker, when the phone is idle it works as the handsfree answerback intercom.
hope that helps,