Voice Over 3G; Chapter 18 Voice Over 3G; Overview; What You Can Do In This Chapter - ZyXEL Communications LTE3302-M432 User Manual

18.1 Overview

4G only supports all-IP-based packet-switched telephony services. When Voice over 3G (Vo3G) is
enabled, the LTE Device supports Circuit Switched FallBack (CSFB) to deliver/receive circuit-switched
voice calls and SMS 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 LTE Device, but not both at the same time.
Note: Vo3G is only available on the LTE3312-M432.

18.1.1 What You Can Do in this Chapter

These screens allow you to configure your LTE Device to make phone calls over the Internet and your
regular phone line, and to set up the phone you connect to the LTE Device.
• Use the General screen to enable Vo3G on the LTE Device
• 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 LTE Device. To access this screen, click Application > Voice over
3G > General.

Voice over 3G

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