MitraStar Movistar GPT-2541GNAC, User Manual

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Chapter 21 Voice 189
Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) detects whether or not speech is present. This lets the Router reduce
the bandwidth that a call uses by not transmitting “silent packets” when you are not speaking.
Comfort Noise Generation
When using VAD, the Router 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 Router. The Router 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 106 Custom Tones Details
LABEL DESCRIPTION
Total Time for All Tones 900 seconds for all custom tones combined
Maximum Time per
Individual Tone
180 seconds
Total Number of Tones
Recordable
5
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:
1 Pick up the phone and press “****” on your phone’s keypad and wait for the message that says you
are in the configuration menu.
2 Press a number from 1101~1105 on your phone followed by the “#” key.
3 Play your desired music or voice recording into the receiver’s mouthpiece. Press the “#” key.