ZyXEL Communications P-2601HN(L)-F1 Series, Руководство пользователя

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Chapter 16 VoIP
P-2601HN(L)-F1 Series User’s Guide
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Each field is described in the following table.
16.9 Technical Reference
This section contains background material relevant to the VoIP screens.
16.9.1 VoIP
VoIP is the sending of voice signals over Internet Protocol. This allows you to
make phone calls and send faxes over the Internet at a fraction of the cost of
using the traditional circuit-switched telephone network. You can also use servers
to run telephone service applications like PBX services and voice mail. Internet
Telephony Service Provider (ITSP) companies provide VoIP service.
Circuit-switched telephone networks require 64 kilobits per second (Kbps) in each
direction to handle a telephone call. VoIP can use advanced voice coding
techniques with compression to reduce the required bandwidth.
Table 55 VoIP > FXO
LABEL DESCRIPTION
Pre-Fix For FXO Outgoing Call
Pre-Fix Number Enter 1 - 7 numbers you dial before you dial the phone number, if you
want to make a regular phone call while one of your SIP accounts is
registered. These numbers tell the ZyXEL Device that you want to make
a regular phone call.
Voice Features
Active G.168
Select this if you want to eliminate the echo caused by the sound of
your voice reverberating in the telephone receiver while you talk.
Active VAD Select this if the ZyXEL Device should stop transmitting when you are
not speaking. This reduces the bandwidth the ZyXEL Device uses.
SIP Fail Over
Force to SIP if
PSTN un-
plugged
Select this check box to have the ZyXEL Device redirect outgoing calls
to the registered SIP account if the ZyXEL Device is not connected to
the PSTN network.
When you try to make a PSTN call, but the PSTN port on the ZyXEL
Device is unplugged, the ZyXEL Device uses the phone port’s registered
SIP account to make the call.
Apply Click Apply to save your changes.
Cancel Click Cancel to restore your previously saved settings.