The Uniden TCX905 accessory handset is a very popular item at Office1000.com. It also generates a lot of confusion!
It is "compatible" with a long list of Uniden Cordless phones. If you have (or buy) one of the compatible phones you can expand the number of handsets with a TCX905. Many customers make a purchase and then write complaining that the TCX905 doesn't register with their base.
It appears that the TCX905 is defective or not compatible with the base unit.
However, according to the instruction manual for the TCX905 (unfortunately in PDF and not plain html) , there is a special procedure to register the TCX905 with many of the base units. See pages 5 & 6.
Please follow those instructions carefully and we're confident your TCX905 will work with any of the phones it is listed as compatible with.
All UPSable
