ZyXEL Communications Prestige 2000W - Manual (Page 22)

Prestige 2000W_V2 User’s Guide
22 Chapter 1 Getting To Know Your Prestige
STUN
Simple Traversal of User Datagram Protocol (UDP) through Network Address Translators
(STUN) allows SIP to pass through NAT routers.
Outbound Proxy
Some VoIP service providers use a SIP outbound server to handle voice calls. This allows the
Prestige to work from behind any type of NAT router and eliminates the need for STUN or a
SIP ALG (Application Layer Gateway).
Voice Coding
The Prestige can use the following voice codecs (coder/decoders).
• G.711
• G.729
Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not transmitting
when you are not speaking. This also helps increase the battery lifetime.
Comfort Noise Generation
The Prestige generates background noise to fill moments of silence when the other device in a
call stops transmitting because the other party is not speaking (as total silence could easily be
mistaken for a lost connection).
PPPoE
PPPoE (Point-to-Point Protocol over Ethernet) facilitates the interaction of a host with an
Internet modem to achieve access to high-speed data networks via a familiar "dial-up
networking" user interface.
Firmware Upgrades
Use the web configurator to upload updated firmware to your Prestige.
1.2 Applications
Here are some examples of how you can use your Prestige.
1.2.1 Place a Call via “SIP Proxy Server” (SIP Call Server)
When you have a (IEEE 802.11b) wireless connection to the Internet, you can use the Prestige
to make and receive VoIP telephone calls through an Internet Telephony Service Provider’s
(ITSP) call server.