Here is a link to the manual. Go to page 34.
http://edocs.mitel.com/UG/EN/2ICP_4150_UG_R2_EN.pdf
Thank you for your response but the question was about a Mitel 4150 phone that runs on a Mitel 3300 system. Thanks!
Sorry about that. Try this one. Just copy and paste it in the address bar. Look on page 34http://edocs.mitel.com/UG/EN/2ICP_4150_U...
Sorry to sound dense but I don't see any "Handset Mute" feature key.
Thanks again for the help!
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