Screeching sound when talking on speaker over POTS lines

Unanswered Question

Hello all,

I am experiencing this strange issue and it's been ongoing for sometime. Hoping someone can help enlighten it !!!

I am using POTS lines with FXO cards and I am experiencing this screeching sound when talking on speaker, the issue seems to happen only when I am talking on speaker and seems to get worse when I talk loud, I am experiencing this issue at all locations with POTS lines and FXO cards, I am using 7940s and 7960s phones.

Has anyone experience this issue ? I appreciate any inputs / suggestions.

thanks so much in advance !!!

Danny

I have this problem too.
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