D-Link DPH-150S - Manual (Page 35)

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6.18. Advance – Phone Settings (Phone Setting)
Tone Setting Select the tone for your particular country
Ringer Type Select the ring type (Tone 1 ~ 4, Melody 5 ~ 8, and MP3 9).
Hold Tone Select melody or tone when the phone is on hold.
Do Not Disturb Reject all incoming calls.
Call Waiting Enable or disable call waiting.
Call Waiting Notify Enable or disable the reminding tone for Call Waiting