ZyXEL Communications ADSL VoIP IAD with 802.11g Wireless 2602HW Series - Manual (Page 46)

Prestige 2602HW Series User’s Guide
46 Chapter 1 Getting To Know Your Prestige
Note: Models ending in “1”, for example Prestige 2602HW-61, denote a device that
works over the analog telephone system, POTS (Plain Old Telephone Service).
Models ending in “3” denote a device that works over ISDN (Integrated
Synchronous Digital System). Models ending in “7” denote a device that works
over T-ISDN (UR-2).
Note: Only use firmware for your Prestige’s specific model. Refer to the label on the
bottom of your Prestige.
The web browser-based Graphical User Interface (GUI) provides easy management.
1.2 Prestige 2602HW-L with Lifeline
The Prestige 2602HW-L has all of the features of the Prestige 2602HW and adds the PSTN
(Public Switched Telephone Network) lifeline feature. PSTN lifeline lets you have VoIP
phone service and PSTN phone service at the same time.
1.3 Features of the Prestige
The following sections describe the features of the Prestige.
PSTN Lifeline
The Prestige 2602HW-L 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 2602HW-L loses power.
REN
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.
Dynamic Jitter Buffer
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.
VoIP Standards Compliance
The Prestige complies with the following VoIP standards.
• SIP version 2 (RFC 3261)
• SDP (RFC 2327)
• RTP (RFC 1889)
• RTCP (RFC 1890)