Appendix A Product Specifications

 

Table 168 Voice Features

 

Firmware update

If your service provider uses this feature, you hear a recorded message when

 

 

enable / disable

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.

 

 

 

 

 

 

Call waiting

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.

 

 

 

 

 

 

Call forwarding

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.

 

 

 

 

 

 

Caller ID

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

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.

 

 

 

 

 

 

REN

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.

 

 

 

 

 

 

Dynamic Jitter

The built-in adaptive buffer helps to smooth out the variations in delay (jitter) for

 

 

Buffer

voice traffic. This helps ensure good voice quality for your conversations.

 

 

 

 

 

 

Multiple SIP

You can simultaneously use multiple voice (SIP) accounts and assign them to

 

 

Accounts

one or both telephone ports.

 

 

 

 

 

 

Multiple Voice

Your device can simultaneously handle multiple voice channels (telephone

 

 

Channels

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

Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not

 

 

Detection/Silence

transmitting when you are not speaking.

 

 

Suppression

 

 

 

 

 

 

 

Comfort Noise

Your device generates background noise to fill moments of silence when the

 

 

Generation

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

Quality of Service (QoS) mechanisms help to provide better service on a per-

 

 

Service)

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.

 

 

 

 

 

 

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P-2602H(W)(L)-DxA User’s Guide