Zyxel-communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNL Manual de usuario descargar pdf (Pagina 179)

P-2602HWNLI User’s Guide

Chapter 11 Voice 179

Note: When the ZyXEL Device does not have power, only the phone connected to the

PHONE 1 port can be used for making calls. Ensure you know which phone

this is, so that in case of emergency you can make outgoing calls.

You can also use the PSTN Line screen to specify phone numbers that should always use the

regular phone service (without having to dial a prefix number). Do this for emergency

numbers (like those for contacting police, fire or emergency medical services).

11.13 ISDN Line

With ISDN line you can make and receive regular ISDN phone calls. Use a prefix number to

make a regular call.

You can also use the ISDN Line screen to specify phone numbers that should always use the

regular phone service (without having to dial a prefix number). Do this for emergency

numbers (like those for contacting police, fire or emergency medical services).

11.13.1 Voice Activity Detection/Silence Suppression

Voice Activity Detection (VAD) detects whether or not speech is present. This lets the ZyXEL

Device reduce the bandwidth that a call uses by not transmitting “silent packets” when you are

not speaking.

11.13.2 Comfort Noise Generation

When using VAD, the ZyXEL Device generates comfort noise when the other party is not

speaking. The comfort noise lets you know that the line is still connected as total silence could

easily be mistaken for a lost connection.

11.13.3 Echo Cancellation

G.168 is an ITU-T standard for eliminating the echo caused by the sound of your voice

reverberating in the telephone receiver while you talk.

11.14 Analog Phone Screen

Use this screen to control which SIP accounts and PSTN line each phone uses. To access this

screen, click VoIP > Phone > Analog Phone.

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Zyxel-communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNL Manual de usuario Pagina 179