Audio Issues - LifeSize Room User Manual

Audio Issues

The following issues are related to the audio quality.
Absent Dial Tone
If you do not receive a dial tone after pressing the or key to initiate a call, ensure
the speaker volume is adjusted appropriately.
Also ensure the line out is securely connected.
An absent dial tone may also result from an unavailable analog phone line connection. If you
are connecting with PSTN, ensure the analog phone connection is secure and that it is
connected to an active phone line jack.
Problematic Sound Quality
If you are unable to hear the phone ring when an incoming call arrives, the speaker volume
may be set too low. (The LEDs flash blue to indicate an incoming call.) Adjust the volume
using the up and down volume key. If you still experience audio problems, adjust the Ring
Tone Volume preference (from the User or Administrator Preferences : Audio menu).
Muffled audio reception from the far side may be caused by highly reverberant rooms. If you
are experiencing poor audio reception, add more sound absorbency to the room and speak
in close proximity to the phone.
Adjust the priority order for your audio codec if you have chosen a low-bandwidth audio
codec to be first. Ensure that the far end caller has configured the phone correctly and is in
an acoustically benign environment. For best results, ensure the far end caller is using a
LifeSize Phone. Audio quality from your LifeSize Room system will vary when calling a non-
LifeSize audio or video unit. LifeSize Room will use the audio codec that the non-LifeSize
system supports.
Degradation in the audio quality can also be caused by faulty microphones or dust and
debris accessing the phone. Do not use any kind of liquid or aerosol cleaner on the phone. A
soft, slightly damp cloth should be sufficient to clean the top surface of the phone if
necessary.
If you experience a high frequency buzzing sound when you plug your LifeSize Room
system into external powered speakers, you may be experiencing common mode noise. To
eliminate this condition, insert an Isolation Transformer (also called a Ground Loop
Eliminator) from your local electronics store between the LifeSize Room output and the
loudspeaker input.
37 LifeSize Room User Guide