AT&T Synapse SB67020 User Manual page 57

Synapse SB67020/SB67025 Deskset User's Guide
To send audio from the headset to the corded handset, lift the handset. If the

handset is already off hook, press HEADSET to send audio to the handset. While
the handset is off hook, you can press HEADSET again to return audio to the
headset.
Call Management 57
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