Hello. I'll be glad to help you with this issue. A few questions:
1) How long have you had this phone?
2) Did Call Waiting previously work with this phone?
OK. Thanks for this information. Just a moment please.
How are you setting the call waiting from 700ms to 900ms?
So sorry. I pulled up a different model
Just a moment please. I'm looking into the issue
I don't see an option to specify the delay that you mentioned from 700ms to 900ms
Initially I looked at a different Panasonic Dect 6.0 phone, but I also don't see it on the KX-TGD224N
I will submit a request for a refund. I recommend checking the call waiting feature using another phone to see if it's working. Thanks for using Just Answer.