ZyXEL Communications P-2601HN(L)-F1 Series User Manual page 248

Chapter 29 Product Specifications
Voice Specifications
Note: To take full advantage of the supplementary phone services available through
the ZyXEL Device's phone port, you may need to subscribe to the services from
your VoIP service provider.
Note: Not all features are supported by all service providers. Consult your service
provider for more information.
Table 76 Voice Features
Call Return
Country Code
Phone config
Call waiting
Call forwarding
Caller ID
Dynamic Jitter
Buffer
Multiple Voice
Channels
Voice Activity
Detection/Silence
Suppression
Comfort Noise
Generation
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With call return, you can place a call to the last number that called
you (either answered or missed). The last incoming call can be
through either SIP or PSTN.
Phone standards and settings differ from one country to another, so
the settings on your ZyXEL Device must be configured to match those
of the country you are in. The country code feature allows you to do
this by selecting the country from a list rather than changing each
setting manually. Configure the country code feature when you move
the ZyXEL Device from one country to another.
The phone config table allows you to customize the phone keypad
combinations you use to access certain features on the ZyXEL Device,
such as call waiting, call return, and call forward. The phone config
table is configurable in command interpreter mode.
This feature allows you to hear an alert when you are already using
the phone and another person calls you. You can then either reject
the new incoming call, put your current call on hold and receive the
new incoming call, or end the current call and receive the new
incoming call.
With this feature, you can set the forward calls to a specified number,
either unconditionally (always), when your number is busy, or when
you do not answer. You can also forward incoming calls from one
specified number to another.
The ZyXEL Device supports caller ID, which allows you to see the
originating number of an incoming call (on a phone with a suitable
display).
The built-in adaptive buffer helps to smooth out the variations in
delay (jitter) for voice traffic. This helps ensure good voice quality for
your conversations.
Your device can simultaneously handle multiple voice channels
(telephone calls). Additionally you can answer an incoming phone call
on a VoIP account, even while someone else is using the account for a
phone call.
Voice Activity Detection (VAD) reduces the bandwidth that a call uses
by not transmitting when you are not speaking.
Your device generates background noise to fill moments of silence
when the other device in a call stops transmitting because the other
party is not speaking (as total silence could easily be mistaken for a
lost connection).
P-2601HN(L)-F1 Series User's Guide