ZyXEL P-2601HNL-F1 User Guide - Page 191
Technical Reference, 16.9.1 VoIP, VoIP > FXO
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Chapter 16 VoIP Each field is described in the following table. 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 unplugged 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. Apply Cancel 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. Click Apply to save your changes. Click Cancel to restore your previously saved settings. 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. P-2601HN(L)-F1 Series User's Guide 191