Follw the instructions below for the hanset that is not regestered.
The full manual can be downloaded from
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?mode=search&session=20100302153603_80.3.156.26&scy=GB&ctn=CD1501B%2F05&ds=CD1501B%2F05&slg=ENG&qslg=on&searchtext=manual&submit=Search
and select 'User manual'
To register your handset manually:
The Master PIN is required before you can register or unregister handsets.
Note
By default, the Master PIN is 0000.
On the base station, press and hold .))) for approximately 5 seconds. LED indicator around the Play/Stop key on the base station blinks.
On the handset, press (menu) key, scroll (using up or down arrows key) to ADVANCED SET and press (OK), scroll to REGISTER and press (OK).
Note
If no action is taken on the handset within 10 seconds, the registration procedure will be aborted. If this happens, repeat Step 1.
Enter the Master PIN when prompted and press (OK) to confirm.
Note
By default, the Master PIN is 0000. WAITING_ _ is displayed on the
screen.
Note
If no action is taken on the handset within
10 seconds, the registration procedure will
be aborted. If this happens, repeat Step 1.