ZyXEL Communications P-2602R-DxA Series - Manual (Page 38)

P-2602R/RL-DxA Series User’s Guide
38 Chapter 1 Getting To Know the ZyXEL Device
Multiple SIP Accounts
You can simultaneously use multiple voice (SIP) accounts and assign them to one or both
telephone ports.
Multiple Voice Channels
Your device 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 Activity Detection/Silence Suppression
Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not transmitting
when you are not speaking.
Comfort Noise Generation
Your device 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).
Echo Cancellation
You device supports G.168, an ITU-T standard for eliminating the echo caused by the sound
of your voice reverberating in the telephone receiver while you talk.
QoS (Quality of Service)
Quality of Service (QoS) mechanisms help to provide better service on a per-flow basis. Your
device supports Type of Service (ToS) tagging and Differentiated Services (DiffServ) tagging.
This allows the device to tag voice frames so they can be prioritized over the network.
SIP ALG
Your device is a SIP Application Layer Gateway (ALG). It allows VoIP calls to pass through
NAT for devices behind it (such as a SIP-based VoIP software application on a computer).
Universal Plug and Play (UPnP)
Your device and other UPnP enabled devices can use the standard TCP/IP protocol to
dynamically join a network, obtain an IP address and convey their capabilities to each other.
PPPoE Support (RFC2516)
PPPoE (Point-to-Point Protocol over Ethernet) emulates a dial-up connection. It allows your
ISP to use their existing network configuration with newer broadband technologies such as
ADSL. The PPPoE driver on your device is transparent to the computers on the LAN, which
see only Ethernet and are not aware of PPPoE thus saving you from having to manage PPPoE
clients on individual computers.