ZyXEL P-2602HW Manuale Utente

 Appendix A Product Specifications

P-2602H(W)(L)-DxA User’s Guide

Firmware update 

enable / disable

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. 

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 

Buffer

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.

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.

Table 168   Voice Features