Aastra 2770ip User Guide Aastra 2770ip - Page 15

Output volume Tab, Echo cancellation, Local echo, Use DirectSound

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Configuring the Softphone Output volume Tab Select the sound card for the audio input and output. The selection is necessary if multiple sound cards or sound-card drivers are installed. The settings for input and output must refer to the same device. When using DirectSound too, the same device must be selected for input and for output in the system's sound and multimedia settings. You can also specify which connected device emits the ringing tones, e.g. a connected headset or a speaker connected to the sound card. The Echo cancellation option reduces audible echo for callers. An echo will be heard if a speaker and a microphone or a badly suppressed headset is used. If this option is activated, the microphone is suppressed, or for hands-free calls it is muted during calls via the receiver as soon as the caller speaks. The Local echo option is only available if your sound card supports the direct output of microphone data to the speaker. This means that speech is played back without delay in suppressed form on your speaker, in the same way that it is on your telephone. This option is only recommended if you are using a headset. The Use DirectSound option allows multiple applications to output acoustic signals simultaneously. This means that you can use the Softphone while playing music data, for example. Deactivate this option if you experience problems with the input and output of audio data. 4.4 Output volume Tab Click on Test and the ring tone will be played. Move the slide control to a position where the ring tone is played back at an adequate and audible volume. 13

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Configuring the Softphone
Output volume Tab
13
Select the sound card for the audio input and output. The selection is necessary if
multiple sound cards or sound-card drivers are installed. The settings for input and
output must refer to the same device. When using DirectSound too, the same
device must be selected for input and for output in the system’s sound and multi-
media settings.
You can also specify which connected device emits the ringing tones, e.g. a con-
nected headset or a speaker connected to the sound card.
The
Echo cancellation
option reduces audible echo for callers. An echo will be
heard if a speaker and a microphone or a badly suppressed headset is used. If this
option is activated, the microphone is suppressed, or for hands-free calls it is
muted during calls via the receiver as soon as the caller speaks.
The
Local echo
option is only available if your sound card supports the direct
output of microphone data to the speaker. This means that speech is played back
without delay in suppressed form on your speaker, in the same way that it is on
your telephone. This option is only recommended if you are using a headset.
The
Use DirectSound
option allows multiple applications to output acoustic
signals simultaneously. This means that you can use the Softphone while playing
music data, for example. Deactivate this option if you experience problems with
the input and output of audio data.
4.4
Output volume Tab
Click on
Test
and the ring tone will be played. Move the slide control to a position
where the ring tone is played back at an adequate and audible volume.