Question about modems

Jim MacKenzie jim at
Thu Nov 14 08:43:59 CST 2019

-----Original Message-----
From: cctalk [mailto:cctalk-bounces at] On Behalf Of Fred Cisin
via cctalk
Sent: Wednesday, November 13, 2019 7:08 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at>
Subject: RE: Question about modems

>What do you need to do to use an acoustic modem with a cellphone?
>You can get a "retro" handset for a cellphone, that will fit the rubber
cups, but, will it work?

I have one of those handsets, and somewhere in the basement, a Radio Shack
acoustic modem, so I could actually try it.

I expect it would work, but would suffer from a lot of line noise because of
how modern telephony works.

My network routes calls via UMTS, not VoLTE.  I've never done a VoLTE call,
so perhaps it would be better.


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