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Chapter 9 Voice
P-2612HNU-Fx User’s Guide
165
9.3 The SIP Account Screen
The ZyXEL Device uses a SIP account to make outgoing VoIP calls and check if an
incoming call’s destination number matches your SIP account’s SIP number. In
order to make or receive a VoIP call, you need to enable and configure a SIP
account, and map it to a phone port. The SIP account contains information that
allows your ZyXEL Device to connect to your VoIP service provider.
See Section 9.4 on page 169 for how to map a SIP account to a phone port.
Use this screen to maintain basic information about each SIP account. You can
also enable and disable each SIP account, configure the volume, echo cancellation
and VAD (Voice Activity Detection) settings for each individual phone port on the
ZyXEL Device.
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.
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.
Echo Cancellation
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.
To access this screen, click VoIP > SIP > SIP Account.