Taking apart a 69XX handset (supervising handset)

[Plainside]

Okay, so it might sound weird, however we have taken apart 53XX handsets to turn them in to supervising handsets (via Rj10 splitters) so that a supervisor can listen in and guide a student/colleague.

I've been tasked to check if its possible with the 69XX handsets as well, and at the moment I'm leaning towards a hard NO.

I've found 3 points around the speaker which hold together the phone-body, however there is no give when pushing down on those points.
All it has done so far is damage the phone (luckily this one wasn't working already).

Has anyone on here managed to take apart a 69XX handset entirely? (and subsequently disabled the microphone from working)

[BlackSunshine]

Why would take the handsets apart?  All you need is a Y adapter for handsets...$8 bucks on Amazon.  We use them all the time.  We also sometimes turn on Silent Monitor on the 3300 to monitor for training purposes too

https://www.amazon.com/Telephone-Training-Adapter-Splitter-Meridican/dp/B00EMTCUP8/ref=asc_df_B00EMTCUP8/?tag=hyprod-20&linkCode=df0&hvadid=198116571093&hvpos=&hvnetw=g&hvrand=4241696574687442420&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9010255&hvtargid=pla-323992244395&psc=1

[Plainside]

Why would take the handsets apart?  All you need is a Y adapter for handsets...$8 bucks on Amazon.  We use them all the time.  We also sometimes turn on Silent Monitor on the 3300 to monitor for training purposes too

*snip*

Because the microphone has to be disabled to avoid confusion toward the customer/caller.

[BlackSunshine]

https://www.amazon.com/Telephone-Training-Adapter-Splitter-Meridican/dp/B0196BLV42/ref=sr_1_1_sspa?dchild=1&keywords=phone+handset+y+adapter&qid=1622035028&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExV1lGU1NTQU03RjI0JmVuY3J5cHRlZElkPUEwNTkwNjUzRExORzRXQzhJTEJGJmVuY3J5cHRlZEFkSWQ9QTAyNzIxNDQyNTZISk1LR01NTEo3JndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==