Vertical Communications DSU and DSU II - Manual (Page 11)

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When both you and the distant party use speakerphones, the
sound-activated switches can occasionally detect both voices
simultaneously, thus blocking out both voices.
•
To manually place a call using your speakerphone,
1. Press the INTERCOM or line button.
2. Dial the number.
3. When party answers, speak toward the telephone.
•
To automatically dial a number using your speakerphone,
1. Press the preprogrammed speed dial or DSS button and speak
toward the telephone when your party answers.
•
To answer a call with your speakerphone,
1. Press the INTERCOM or line button with flashing red
or orange light.
2. Speak toward the telephone to answer the call.
3. To end a call with your speakerphone, press SPEAKER.
GCA70–245 Introducing The LCD Speakerphone
LCD Speakerphone Reference Manual 1–5