Chapter 9 Voice

Table 57 VoIP > SIP > SIP Account (continued)

LABEL

DESCRIPTION

Primary

Select the type of voice coder/decoder (codec) that you want the P-

Compression

2812HNU-51c to use.

Type

G.711 provides high voice quality but requires more bandwidth (64

 

Secondary

kbps). G.711 is the default codec used by phone companies and digital

Compression

handsets.

Type

• G.711a is typically used in Europe.

 

Third

• G.711u is typically used in North America and Japan.

Compression

G.722 is a 7 KHz wideband voice codec that operates at 48, 56 and 64

Type

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

Enter the loudness that the P-2812HNU-51c uses for speech that it

Volume Control

sends to the peer device.

 

Minimum is the quietest, and Maximum is the loudest.

 

 

Listening

Enter the loudness that the P-2812HNU-51c uses for speech that it

Volume Control

receives from the peer device.

 

Minimum is the quietest, and Maximum is the loudest.

 

 

Enable G.168

Select this if you want to eliminate the echo caused by the sound of

(Echo

your voice reverberating in the telephone receiver while you talk.

Cancellation)

 

 

 

Enable VAD

Select this if the P-2812HNU-51c should stop transmitting when you are

(Voice Active

not speaking. This reduces the bandwidth the P-2812HNU-51c uses.

Detector)

 

 

 

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

Select this to enable call transfer on the P-2812HNU-51c. This allows

Transfer

you to transfer an incoming call (that you have answered) to another

 

phone.

 

 

Enable Call

Select this to enable call waiting on the P-2812HNU-51c. This allows

Waiting

you to place a call on hold while you answer another incoming call on

 

the same telephone number.

 

 

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P-2812HNU-51c User’s Guide