NR/FWA Indoor Series User’s Guide
239
CHAPTER 19
Voice
19.1 Voice Overview
You can make calls over the Internet using VoIP technology. For this, you first need to set up a SIP
account with a SIP service provider.
Use this chapter to:
• Connect an analog phone to the Zyxel Device.
• Configure settings such as speed dial.
• Configure network settings to optimize the voice quality of your phone calls.
5G only supports all-IP based packet-switched telephony services. When Voice service is enabled, the
Zyxel Device supports Circuit Switched FallBack (CSFB) to deliver or receive circuit-switched voice calls
and text messages through a 3G mobile network and then goes back to the 5G network to transmit
data packets.
With the voice service, users do not need a SIP account and SIP server to make phone calls over the
Internet.
19.1.1 What You Can Do in this Chapter
These screens allow you to configure your Zyxel Device to make phone calls over the Internet and your
regular phone line, and to set up the phone you connect to the Zyxel Device.
• Use the Voice Mode screen to enable VoIP or VoLTE services on the Zyxel Device (Section 19.2 on
page 240).
• Use the SIP Account screen to set up information about your SIP account, control which SIP accounts
the phones connected to the Zyxel Device use, and configure audio settings such as volume levels
for the phones connected to the Zyxel Device (Section 19.4 on page 241).
• Use the SIP Service Provider screen to configure the SIP server information, and the numbers for
certain phone functions (Section 19.5 on page 244).
• Use the Phone screens to change settings that depend on which region of the world the Zyxel Device
is in (Section 19.6 on page 249).
• Use the Call Rule screen to set up shortcuts for dialing frequently-used (VoIP) phone numbers (Section
19.8 on page 251).
• Use the Call History screen to view a call history list (Section 19.9 on page 252).
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