Phone; Pstn Line ('L" Models Only); Voice Activity Detection/Silence Suppression; Comfort Noise Generation - ZyXEL Communications P-2602R-DxA Series User Manual

Table 40 SIP > QoS
LABEL
Voice VLAN ID
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10.11 Phone

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.

10.11.1 PSTN Line ('L" Models only)

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.
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).
Note: When the ZyXEL Device does not have power, only the phone connected to
the PHONE 2 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.

10.11.2 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.

10.11.3 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.
Chapter 10 Voice
DESCRIPTION
Select this if the ZyXEL Device has to be a member of a VLAN to communicate
with the SIP server. Ask your network administrator, if you are not sure. Enter the
VLAN ID provided by your network administrator in the field on the right. Your LAN
and gateway must be configured to use VLAN tags.
Otherwise, clear this field.
Click this to save your changes and to apply them to the ZyXEL Device.
Click this to set every field in this screen to its last-saved value.
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