Chapter 9 Voice
P-2812HNU-51c User’s Guide
200
Primary
Compression
Type
Secondary
Compression
Type
Third
Compression
Type
Select the type of voice coder/decoder (codec) that you want the P-
2812HNU-51c 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.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.
G.726 operates at 24 or 32 kbps.
The P-2812HNU-51c must use the same codec as the peer. When two
SIP devices start a SIP session, they must agree on a codec.
Select the P-2812HNU-51c’s first choice for voice coder/decoder.
Select the P-2812HNU-51c’s second choice for voice coder/decoder.
Select None if you only want the P-2812HNU-51c to accept the first
choice.
Select the P-2812HNU-51c’s third choice for voice coder/decoder. Select
None if you only want the P-2812HNU-51c to accept the first or second
choice.
Speaking
Volume Control
Enter the loudness that the P-2812HNU-51c uses for speech that it
sends to the peer device.
Minimum is the quietest, and Maximum is the loudest.
Listening
Volume Control
Enter the loudness that the P-2812HNU-51c uses for speech that it
receives from the peer device.
Minimum is the quietest, and Maximum 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 P-2812HNU-51c should stop transmitting when you are
not speaking. This reduces the bandwidth the P-2812HNU-51c uses.
Call Features
Send Caller ID Select this if you want to send identification when you make VoIP phone
calls. Clear this if you do not want to send identification.
Enable Call
Transfer
Select this to enable call transfer on the P-2812HNU-51c. This allows
you to transfer an incoming call (that you have answered) to another
phone.
Enable Call
Waiting
Select this to enable call waiting on the P-2812HNU-51c. This allows
you to place a call on hold while you answer another incoming call on
the same telephone number.
Table 57 VoIP > SIP > SIP Account (continued)
LABEL DESCRIPTION
