Cisco SPA 500 User Manual page 22

Getting Started
Using Phone Hardware and Accessories
Cisco Small Business Pro IP Phone SPA 525G (SIP) User Guide
To switch from the handset to the speakerphone, press the Speakerphone button
and place the handset back on the hook.
To switch from the speakerphone to a headset, press the Headset button.
To switch from the speakerphone to the handset, pick up the handset.
To switch from the headset to the speakerphone, press the Speakerphone button.
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