Polycom ViewStation SP128 User Manual page 52

Chapter 2
ViewStation SP User Guide
Audio Quality
The Audio Quality Preference screen (System Info > Admin
Setup > Video Network > IMUX > Audio Quality) allows the
selection of an audio protocol. G.722 audio delivers a higher quality
of audio than G.728 and uses 48 Kbps of the call bandwidth. G.728
delivers telephone quality audio and only uses 16 Kbps of the call
bandwidth. G.728 is generally used for lower data rates.
To set the audio protocol, use the + and - zoom buttons on the
remote control to move the slider.
Note Changing the audio quality preferences in a call can only be
done in an H.320 call. No changes can be made while in an
H.323 call.
Figure 2-11. Audio Quality Screen
Advanced Dialing
On the Advanced Dialing screen (System Info > Admin Setup >
Video Network > IMUX > Advanced Dialing) you can define how
each ISDN channel is dialed. By default, channels are dialed in
parallel.
• Dial channels in parallel: When this option is selected,
the ViewStation SP dials all ISDN channels
simultaneously.
• Dial channels one at a time: When selected, the
ViewStation SP dials each ISDN channel one at a time
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Optional Configurations
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