ZyXEL Communications PRESTIGE 2302RL User Manual page 37

Multiple Telephones
You can connect more than one telephone to a Prestige telephone port. The Ringer
Equivalence Number (REN) is used to determine the number of devices that may be connected
to the telephone line. See the
PSTN Lifeline
The Prestige 2302RL allows you to connect 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 2302RL loses power.
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.
Multiple SIP Accounts
The Prestige allows you to simultaneously use multiple voice (SIP) accounts and assign them
to one or both telephone ports.
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).
Multiple Voice Channels
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.
Voice Coding
The Prestige can use the following voice codecs (coder/decoders).
• G.711
• G.729
Chapter 1 Introducing the Prestige
Table 138 on page 341 for the Prestige's REN.
P-2302R Series User's Guide
37