Voice Over 3G; Chapter 18 Voice Over 3G; Overview; What You Can Do In This Chapter - ZyXEL Communications LTE3311 series User Manual

18.1 Overview

4G only supports all-IP-based packet-switched telephony services. When Voice over 3G (Vo3G) is
enabled, the LTE3311 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 LTE3311, but not both at the same time.

18.1.1 What You Can Do in this Chapter

These screens allow you to configure your LTE3311 to make phone calls over the Internet and your
regular phone line, and to set up the phone you connect to the LTE3311.
• Use the General screen to enable Vo3G on the LTE3311
• Use the Phone Book screen to manage your contact names and phone numbers
on page 137).
• Use the Telephone Conf. screen to configure call features
• Use the Call Conf. screen to maintain rules for handling incoming calls
139).

18.2 Vo3G General Screen

Use this screen to enable Vo3G on the LTE3311. To access this screen, click Application > Voice
over 3G > General.
Figure 88 Application > Voice over 3G > General
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LTE3311 Series User's Guide
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Voice over 3G

(Section 18.2 on page 136).
(Section 18.3
(Section 18.4 on page
(Section 18.5 on page
1 8
138).