Cisco IP Phone SPA 504G - Manual (Page 22)

Installing Your Phone
Mounting the Phone to the Wall (Optional)
Cisco Small Business Pro IP Phone SPA 504G User Guide (SIP) 16
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STEP 5 Hang onto screws mounted in the wall.
Reversing the Handset Retention Tab
If you mount the phone to a vertical surface, you must reverse the handset retention tab on the
phone body so that the handset does not fall off the phone when it is placed on the cradle.
STEP 1 Push the latch in.
STEP 2 Slide the retention tab up until it detaches from the phone.