ZyXEL Communications P-2602H User Manual page 377

Table 168 Voice Features
Firmware update
enable / disable
Call waiting
Call forwarding
Caller ID
Trunking
REN
Dynamic Jitter
Buffer
Multiple SIP
Accounts
Multiple Voice
Channels
Voice Activity
Detection/Silence
Suppression
Comfort Noise
Generation
Echo Cancellation
QoS (Quality of
Service)
P-2602H(W)(L)-DxA User's Guide
If your service provider uses this feature, you hear a recorded message when
you pick up the phone when new firmware is available for your ZyXEL Device.
Enter *99# in your phone's keypad to have the ZyXEL Device upgrade the
firmware, or enter #99# to not upgrade. If your service provider gave you
different numbers to use, enter them instead. If you enter the code to not
upgrade, you can make a call as normal. You will hear the recording again each
time you pick up the phone, until you upgrade.
This feature allows you to hear an alert when you are already using the phone
and another person calls you. You can then either reject the new incoming call,
put your current call on hold and receive the new incoming call, or end the
current call and receive the new incoming call.
With this feature, you can set the ZyXEL Device to forward calls to a specified
number, either unconditionally (always), when your number is busy, or when
you do not answer. You can also forward incoming calls from one specified
number to another.
The ZyXEL Device supports caller ID, which allows you to see the originating
number of an incoming call (on a phone with a suitable display).
Trunking connects an IP network (like the Internet) with the regular telephone
network (PSTN). The main advantage of trunking is that you can call your
ZyXEL Device on the PSTN network, and then use it to make a VoIP phonecall.
For example, if you have a ZyXEL Device at your office you can call into it from
your cellphone and use it to make a long-distance or international VoIP call at a
reduced cost.
A Ringer Equivalence Number (REN) is used to determine the number of
devices (like telephones or fax machines) that may be connected to the
telephone line. Your device has a REN of three, so it can support three devices
per telephone port.
The built-in adaptive buffer helps to smooth out the variations in delay (jitter) for
voice traffic. This helps ensure good voice quality for your conversations.
You can simultaneously use multiple voice (SIP) accounts and assign them to
one or both telephone ports.
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 (VAD) reduces the bandwidth that a call uses by not
transmitting when you are not speaking.
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).
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.
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.
Appendix A Product Specifications
377