User's Manual

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8.7 Voice
VoLTE: Select Turn on to activate VoLTE on the router. Select
Turn off to use CSFB (Circuit-Switched Fallback).
DTMF (Dual Tone Multi-Frequency) tones are used during a call
to signal to a far-end device; these signals may be for
navigating a menu system, entering data, or for other types of
manipulation. For the Select DTMF tones, select Inband or
Outband. It is recommended that you do not change the
default settings.