We need to have an extension ring on incoming phone calls that aren't answered after 3 rings. We have an NEC DTH-16D. Thank you. Jana

Asked by jana on 07/20/2015 0  Answer

ManualsOnline posted an answer 8 years, 2 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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