“Is the KX-TCA430 compatible with the KX-DT521 phone?”
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Hi! This headset is designed for cordless phones and corded phones equipped with a 3/32 in. (2.5mm) diameter jack. Also, this headset is designed for 900 MHz, 2.4 GHz, 5.8 GHz analog and digital systems and DECT 6.0. We would advise contacting a Dealer or Installer as the unit is supported by them. If you can not get in contact with one, please email our Business Telephone System Department: sipsupport@us.panasonic.com . If the Department can not assist and a Dealer is needed, they will find one for you. Also, the number for the department is this one: 800-225-5329. Hope this helps! -C
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