ZyXEL Communications LTE5388-M804 - Overview; Voice; Voice Mode; What You Can Do in this Chapter

LTE Series User’s Guide
210
CHAPTER 17
Voice
17.1 Overview
4G only supports all-IP-based packet-switched telephony services. When Voice service is enabled, the
Zyxel Device supports Circuit Switched FallBack (CSFB) to deliver/receive circuit-switched voice calls
and text messages via a 3G mobile network and then goes back to the 4G LTE 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.
17.1.1 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 17.2 on
page 210).
• Use the SIP Account screen to set up information about your SIP account, control which SIP accounts
the phones connected to the LTE Device use and configure audio settings such as volume levels for
the phones connected to the ZyXEL Device (Section 17.3.1 on page 211).
• Use the SIP Service Provider screen to configure the SIP server information, and the numbers for
certain phone functions (Section 17.3.3 on page 215).
• Use the Phone screen to change settings that depend on which region of the world the Zyxel Device
is in (Section 17.4 on page 219).
• Use the Call Rule screen to set up shortcuts for dialing frequently-used (VoIP) phone numbers (Section
17.5 on page 219).
• Use the Call History screen to view a call history list(Section 17.6 on page 220).
17.2 Voice Mode
Use this screen to enable VoIP or VoLTE services on the Zyxel Device. To access this screen, click Voice >
Voice Mode.