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Yes and no Yes, it works with all systems and No just one call at a time as far as I am aware.
Sorry, there was a problem. Please try again later.Brenda - The VTech IS8151-4 is designed to work with regular, residential, cable and VOIP lines. The unit is a single line phone. It can only accommodate one telephone number. If you are looking for a phone where multiple people can be on different calls at different lines at the same time, you may check the 4-line model CM18445. Thank you! - VTech Support
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