Like others, cannot hear person talking with on landline, but they can hear me

I have the same problem as those who created the similar November 13, 2024 post.

I have had this issue since Jan 26 (shortly after Comcast did some local "network upgrades" in our neighborhood).

In addition to upgrading my cable voice modem (CM1150V to CM2050V) for $300, I did the usual troubleshooting: restart modem, using a different phone system, checking cables, moving the jack to Tel2, etc. Even had a Comcast tech come out Feb 7 to check outside/inside configurations, reset my equipment. The problem didn't reproduce for them (they only waited 9 minutes into the test call) but persisted in the evening after they left.

The issue surfaces totally randomly. It could be 20 minutes into the conversation, or 5, or 1 minute. In all cases the other party can still hear me, so it really isn't a "dropped" call. I have been using the CM1150V modem since 2019 with no problems until now. And now the upgrade to CM2050V hasn't helped.

Please help as I need my landline phone uninterrupted for when I work at home. Thanks.