ZyXEL Communications P-2602 Manuel D’Utilisation

P-2602H(W)(L)-DxA Series User’s Guide

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Chapter 11 Voice

You can configure the volume, echo cancellation and VAD settings for each individual phone 
port on the ZyXEL Device. You can also select which SIP account to use for making outgoing 
calls.

With PSTN line you can make and receive regular PSTN phone calls. Use a prefix number to 
make a regular call. When the device does not have power, you can make regular calls without 
dialing a prefix number.

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).

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.

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.

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.

Apply

Click this to save your changes and to apply them to the ZyXEL Device.

Cancel

Click this to set every field in this screen to its last-saved value.

Table 56   SIP > QoS