What You Need To Know About Voip; Before You Begin; The Sip Account Screen - ZyXEL Communications VMG892-B10A User Manual

Chapter 21 Voice

21.1.2 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).
SIP
SIP stands for Session Initiation Protocol. SIP is a signalling standard that lets one network device
(like a computer or the Device) send messages to another. In VoIP, these messages are about
phone calls over the network. For example, when you dial a number on your Device, it sends a SIP
message over the network asking the other device (the number you dialed) to take part in the call.
SIP Accounts
A SIP account is a type of VoIP account. It is an arrangement with a service provider that lets you
make phone calls over the Internet. When you set the Device to use your SIP account to make
calls, the Device is able to send all the information about the phone call to your service provider on
the Internet.
Strictly speaking, you don't need a SIP account. It is possible for one SIP device (like the Device) to
call another without involving a SIP service provider. However, the networking difficulties involved
in doing this make it tremendously impractical under normal circumstances. Your SIP account
provider removes these difficulties by taking care of the call routing and setup - figuring out how to
get your call to the right place in a way that you and the other person can talk to one another.
How to Find Out More
See Chapter 4 on page 37
scenario.
See Section 21.10 on page 252

21.2 Before You Begin

• Before you can use these screens, you need to have a VoIP account already set up. If you don't
have one yet, you can sign up with a VoIP service provider over the Internet.
• You should have the information your VoIP service provider gave you ready, before you start to
configure the Device.

21.3 The SIP Account Screen

The Device uses a SIP account to make outgoing VoIP calls and check if an incoming call's
destination number matches your SIP account's SIP number. In order to make or receive a VoIP
236
for a tutorial showing how to set up these screens in an example
for advanced technical information on SIP.
VMG8924-B10A and VMG8924-B30A Series User's Guide