User guide

7-1
Chapter 7: VoIP Settings
Voice over Internet Protocol (VoIP) technology is a way of using the Internet to make
phone calls. Phone calls can be tranmitted over the Internet by encoding a voice call
into data packets at one end and then decoding it back into voice calls at the other
end. This encoding and decoding is from a analog signal (your voice) into a digital
signal (data packets) and then back into an analog signal.
The RG230 uses Session Initiation Protocol (SIP) as the control mechanism that
sets up, initiates, and terminates calls between a caller and a called party. The SIP
messaging makes use of “Proxy,” “Redirect,” and “Registration” servers to process
call requests and find the location of called parties across the Internet. When SIP
has set up a call between two parties, the actual voice communication is a direct
peer-to-peer connection using the standard Real-Time Protocol (RTP), which
streams the encoded voice data across the network.
You can make VoIP calls by connecting a regular phone to one of the RG230’s
RJ-11 Phone ports. You can also make VoIP calls from your computer using a VoIP
application with a simple microphone and computer speakers. Using either method,
VoIP provides an experience identical to normal telephoning.
Before using the VoIP Phone ports on the RG230, you must have an account with a
SIP service provider and configure the required parameters through the web
interface. The RG230 allows the two RJ-11 Phone ports to be configured separately
with different settings.
The VoIP configuration pages include the following options.
Table 7-1. VoIP Settings
Menu Description Page
SIP Account Sets up basic SIP account details for Phone 1 and Phone 2 7-2
SIP Setting Configures SIP connection parameters 7-3
Dial Plan Sets control strings for dialed phone numbers 7-4
Call Feature Configures call forwarding options 7-6
Codecs Select coder/decoders (codecs) to use for phone traffic 7-8
Call Block Setting Set incoming and outgoing numbers to block 7-9
Phone Setting Sets phone timeout parameters 7-10