Nortel Networks SoundPoint IP 550 - Manual (Page 15)

Getting Started with Your SoundPoint ® IP 550 Desktop Phone
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3. Snap them together to lock the base to the phone.
To attach the base as a wall mount:
1. Place all cords in the recessed area above the modular jacks.
2. On the back of the phone, remove the key located behind the hookswitch
and reposition it so that the end tab (at a 45 0 angle) is facing up.