Poor network quality can affect the audio quality of your calls. Check the following to improve network quality:
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We recommend that you do not make calls over a wireless internet connection, virtual private network (VPN), or remote access service (RAS) connections.
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If bandwidth is a problem, limit other computer activities while in a call.
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If you can, stop unnecessary audio or video.
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Check whether other computers on the network are using a lot of resources or performing heavy downloads or uploads, and see if they can be delayed or halted.
