Chapter 20 Voice
PMG5317-T20A User’s Guide
206
20.1.2 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 GPON 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 GPON 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 GPON Device to use your SIP account to
make calls, the GPON 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 GPON
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 32 for a tutorial showing how to set up these screens in an example
scenario.
See Section 20.8 on page 219 for advanced technical information on SIP.
20.2 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 GPON Device.
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