Voice Over 3G; Chapter 18 Voice Over 3G; Overview; What You Can Do In This Chapter - ZyXEL Communications LTE5366 Series User Manual

18.1 Overview

4G only supports all-IP-based packet-switched telephony services. When Voice over 3G (Vo3G) is
enabled, the LTE5366 supports Circuit Switched FallBack (CSFB) to deliver/receive circuit-switched voice
calls and text messages via a 2G/3G mobile network and then goes back to the 4G LTE network to
transmit data packets.
With Vo3G, users do not need a SIP account and SIP server to make phone calls over the Internet.
Note: You can enable either VoIP or Vo3G on the LTE5366, but not both at the same time.

18.1.1 What You Can Do in this Chapter

These screens allow you to configure your LTE5366 to make phone calls over the Internet and your
regular phone line, and to set up the phone you connect to the LTE5366.
• Use the General screen to enable Vo3G on the LTE5366
• Use the Phone Book screen to manage your contact names and phone numbers
page 123).
• Use the Telephone Conf. screen to configure call features
• Use the Call Conf. screen to maintain rules for handling incoming calls

18.2 Vo3G General Screen

Use this screen to enable Vo3G on the LTE5366. To access this screen, click Configuration > Application >
Voice over 3G > General.
Figure 78 Configuration > Application > Voice over 3G > General
C

Voice over 3G

LTE5366 Series User's Guide
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H A P T E R
(Section 18.2 on page 122).
(Section 18.4 on page
(Section 18.5 on page
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(Section 18.3 on
124).
125).