Chapter 9 Voice

Voice Activity Detection/Silence Suppression

Voice Activity Detection (VAD) detects whether or not speech is present. This lets the P-2812HNU-51c reduce the bandwidth that a call uses by not transmitting “silent packets” when you are not speaking.

Comfort Noise Generation

When using VAD, the P-2812HNU-51c 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.

MWI (Message Waiting Indication)

Enable Message Waiting Indication (MWI) enables your phone to give you a message–waiting (beeping) dial tone when you have a voice message(s). Your VoIP service provider must have a messaging system that sends message waiting status SIP packets as defined in RFC 3842.

Custom Tones (IVR)

IVR (Interactive Voice Response) is a feature that allows you to use your telephone to interact with the P-2812HNU-51c. The P-2812HNU-51c allows you to record custom tones for the Early Media and Music On Hold functions. The same recordings apply to both the caller ringing and on hold tones.

Table 66 Custom Tones Details

LABEL

DESCRIPTION

Total Time for All Tones

900 seconds for all custom tones combined

 

 

Maximum Time per

180 seconds

Individual Tone

 

 

 

Total Number of Tones

5

Recordable

You can record up to 5 different custom tones but the total

 

 

time must be 900 seconds or less.

 

 

Recording Custom Tones

Use the following steps if you would like to create new tones or change your tones:

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P-2812HNU-51c User’s Guide