A:AnswerHello. We do not recommend this type of usage as there may be issues with interferences. Should you still wish to use the other telephone set, make sure that only one answering machine is turned on. – G
A:AnswerHello. Yes, however, please make sure that the DTMF function (touch tones) is enabled on your telephone service, by your provider otherwise it will not work. -G
A:AnswerThe messages tell the time and the DAY, but not the date -- a problem if you're gone more than a week, since the day named may be from early in the absence or late.
A:AnswerHi! This model does not have Bluetooth, nor a headset jack, therefore you cannot pair any headset to it. We do have models that have either a headset jack or Bluetooth. -A