AT&T DLP73290 - I cannot connect my cell phone with the telephone base.; I cannot connect my headset with the telephone base.; I cannot download contacts from my cell phone to my DLP73290;DLP73390;DLP73490;DLP73590.

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Appendix
Add and register handsets/headsets
If registration fails, the system will automatically try to register again. If
registration fails aer the third try, Registration failed appears on the handset
screen. The handset shows To register HS... and ...see manual, and the
telephone base returns to idle mode. This may take up to ve minutes to occur.
Please start again from Step 1.
Notes:
f You cannot register a handset if any other system handset is in use.
f If you try to register more than ve handsets to the telephone base, the telephone base shows Registration slots
are full and sounds two beeps..