Chapter 21 Voice
VMG8924-B10A and VMG8924-B30A Series User’s Guide
239
Apply To Phone Select a phone port on which you want to make or receive phone calls for this
SIP account.
If you map a phone port to more than one SIP account, there is no way to
distinguish between the SIP accounts when you receive phone calls. The Device
uses the most recently registered SIP account first when you make an outgoing
call.
If a phone port is not mapped to a SIP account, you cannot receive or make any
calls on the phone connected to this phone port.
more/less Click more to display and edit more information for the SIP account. Click less
to display and configure the basic SIP account settings.
URI Type Select whether or not to include the SIP service domain name when the Device
sends the SIP number.
SIP - include the SIP service domain name.
TEL - do not include the SIP service domain name.
Voice Features
Primary
Compression
Type
Secondary
Compression
Type
Third
Compression
Type
Select the type of voice coder/decoder (codec) that you want the Device to use.
G.711 provides high voice quality but requires more bandwidth (64 kbps). G.711
is the default codec used by phone companies and digital handsets.
• G.711a is typically used in Europe.
• G.711u is typically used in North America and Japan.
G.726-24 operates at 24 kbps.
G.726-32 operates at 32 kbps.
G.722 is a 7 KHz wideband voice codec that operates at 48, 56 and 64 kbps. By
using a sample rate of 16 kHz, G.722 can provide higher fidelity and better audio
quality than narrowband codecs like G.711, in which the voice signal is sampled
at 8 KHz.
The Device must use the same codec as the peer. When two SIP devices start a
SIP session, they must agree on a codec.
Select the Device’s first choice for voice coder/decoder.
Select the Device’s second choice for voice coder/decoder. Select None if you
only want the Device to accept the first choice.
Select the Device’s third choice for voice coder/decoder. Select None if you only
want the Device to accept the first or second choice.
Speaking Volume
Control
Select the loudness that the Device uses for speech that it sends to the peer
device.
-12 is the quietest, and 12 is the loudest.
Listening Volume
Control
Select the loudness that the Device uses for speech that it receives from the
peer device.
-12 is the quietest, and 12 is the loudest.
Enable G.168
(Echo
Cancellation)
Select this if you want to eliminate the echo caused by the sound of your voice
reverberating in the telephone receiver while you talk.
Enable VAD
(Voice Active
Detector)
Select this if the Device should stop transmitting when you are not speaking.
This reduces the bandwidth the Device uses.
Call Features
Table 111 VoIP > SIP > SIP Account > Add new accoun/Edit (continued)
LABEL DESCRIPTION
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