VMG/XMG Series User’s Guide
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CHAPTER 23
Voice
23.1  Voice Overview
You can make calls over the Internet using VoIP technology. For this, you first need to set up a SIP 
account with a SIP service provider.
Use this chapter to:
• Connect an analog phone to the Zyxel Device.
• Configure settings such as speed dial.
• Configure network settings to optimize the voice quality of your phone calls.
23.1.1  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 phones you connect to the Zyxel Device.
• Use the SIP Account screen (Section 23.3 on page 298) to set up information about your SIP account, 
control which SIP accounts the phones connected to the Zyxel Device use and configure audio 
settings such as volume levels for the phones connected to the Zyxel Device.
• Use the SIP Service Provider screen (Section 23.4 on page 303) to configure the SIP server information, 
QoS for VoIP calls, the numbers for certain phone functions, and dialing plan. 
• Use the Region screen (Section 23.6 on page 310) to change settings that depend on the country you 
are in.
• Use the Call Rule screen (Section 23.7 on page 311) to set up shortcuts for dialing frequently-used 
(VoIP) phone numbers.
• Use the Call History screen (Section 23.8 on page 312) to view detailed information for each outgoing 
call you made or each incoming call from someone calling you.
• Use the Call Summary screen (Section 23.9 on page 313) to view the summary list of received, dialed 
and missed calls.
You don’t necessarily need to use all these screens to set up your account. In fact, if your service 
provider did not supply information on a particular field in a screen, it is usually best to leave it at its 
default setting.
23.1.2  What You Need to Know About VoIP
VoIP
VoIP stands for Voice over IP. IP is the Internet Protocol, which is the message-carrying standard the 
Internet runs on. So, Voice over IP is the sending of voice signals (speech) over the Internet (or another 
network that uses the Internet Protocol).