TL86103 Can't hear person on line 1 when someone is dialing line 2

Try dialing from line two with a plain old corded phone, see if it does the same thing. What test have you done and what service do you have?

I will try that.  I have not done any test, I have just noticed when I am on the corded phone with a customer and someone dials out with the cordless phone.  We have Spectrum for our phone service.

Might try resetting the Spectrum modem first to see it that clears it up.