Reduce ringer volume on Commax DP-SS Intercom handset (ABSOLUTE beginner)

[Ellie D]

Hi there, no electronics knowledge at all I'm afraid, so please frame your answers as though addressing a small spotted terrier.... I'm keen but limited.  At work there's a Commax DP-SS intercom handset close to my head.  I'm hoping to significantly lower the ringtone using mechanical means, i.e glue foam to a speaker or something along those lines.  I opened the unit... very proud of that .... & found no discernible speaker at all.  Please see pics.  I don't have the knowledge to do anything fancy.  if handsets come with a volume adjuster  I could possibly wire that in instead.  I'd also be capable of throwing the current one out the window but that's not ideal.  In terms of compromise, I don't even need to be able to hear/speak to the front door guest.  A quiet ringtone would prompt me to walk to the door (without even speaking to the person).  Any dumbed down assistance much appreciated.  Thank you

[Ellie D]

Seems like initial post didn't accept both images so I'm attaching again here.  Thnx

[妖怪女]

That's weird. I looked at a picture of the model. What is on the other side of the base? (the cover) I see the speaker hole pattern in a picture. There is no speaker there?

If not, try taping the hang-up button down, and move the handset a few feet from the base and then have somebody ring the bell and see if the sound is actually coming from the handset.

[Rmen]

Hello
Please make photo from back of PCB that show all wire track very clear and send.
I think sound generat out side of this device.
so after re engg shematic diagram it is possible better help.
Regards
Rmen