ZyXEL Communications LTE3311 series - Voice over 3 G; Chapter 18 Voice over 3 G; Overview; What You Can Do in this Chapter

LTE3311 Series User’s Guide
136
CHAPTER 18
Voice over 3G
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 (Section 18.2 on page 136).
•Use the Phone Book screen to manage your contact names and phone numbers (Section 18.3
on page 137).
•Use the Telephone Conf. screen to configure call features (Section 18.4 on page 138).
•Use the Call Conf. screen to maintain rules for handling incoming calls (Section 18.5 on page
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