ZyXEL Communications prestige 2002 series 사용자 설명서

Prestige 2002 Series User’s Guide

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Chapter 1 Introducing the Prestige

The Prestige 2002L has a LINE port for connecting a PSTN line. You can receive incoming 
PSTN phone calls even while someone else connected to the Prestige is making VoIP phone 
calls. You can dial a (prefix) number to make an outgoing PSTN call. You can still make 
PSTN phone calls if the Prestige 2002L loses power.

A Ringer Equivalence Number is used to determine the number of devices that may be 
connected to the telephone line. The Prestige can support three devices per telephone port.

The Prestige has a built-in adaptive, buffer that helps to smooth out the variations in delay 
(jitter) for voice traffic. This helps ensure good voice quality for your conversations.

The Prestige complies with the following standards.

• SIP version 2 (RFC 3261)
• SDP (RFC 2327)
• RTP (RFC 1889)
• RTCP (RFC 1890)
• SIP NAT Traversal (STUN) (RFC 3489)

The Prestige allows you to simultaneously use multiple voice (SIP) accounts and assign them 
to one or both telephone ports.

Simple Traversal of User Datagram Protocol (UDP) through Network Address Translators 
(STUN) allows SIP to pass through NAT routers.

The Prestige can simultaneously handle multiple voice channels (telephone calls). 
Additionally you can answer an incoming phone call on a VoIP account, even while someone 
else is using the account for a phone call.

The Prestige can use the following voice codecs (coder/decoders).

• G.711
• G.729