Zoom X5V - Manual (Page 78)

78 ADSL X5v User’s Guide
Sometimes it’s hard to understand people on VoIP calls.
If you are making or receiving VoIP calls during a period when
there is very heavy Internet traffic, you may notice an effect on
voice quality. For example, you may encounter a delay in hearing
the other person talk, or there may be brief intervals where it’s
difficult to understand what the other person is saying. Sometimes
this is unavoidable. Your service or some other connecting link
between you and the person you are calling may become
congested. If someone is using the ADSL line to download or
upload large files—music or video files, for example—while you
are on the phone, it may affect voice quality. You may want to
avoid this situation.