NEC UNIVERGE SV8100 Features & Specifications Manual page 252

Issue 5.0
To listen to the incoming trunk ring choices:
1. Press Speaker.
2. Dial 811 + 2.
3. Select the ringing (1~8) and tone range (1~4) you want to check.
4. Go back to step 3 to listen to additional choices or press Speaker to hang up.
To change the ringing of your incoming trunk:
1. Press Speaker.
2. Dial 820 + 2.
3. Select the ringing (1~8).
4. Press Speaker to hang up.
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UNIVERGE SV8100
Central Office Calls, Answering