More Than One Cordless Telephone - NEC Dterm Cordless Lite II Owner's Manual

NEC Unified Solutions, Inc.
Finally, it should be noted that some cordless telephones operate at
frequencies that may cause interference to nearby TVs and VCRs. To
minimize or prevent such interference, the base of the cordless telephone
should not be placed near or on top of a TV or VCR. If interference is
experienced, moving the cordless telephone farther away from the TV or VCR
will often reduce or eliminate the interference.

More than One Cordless Telephone

If you want to use more than one cordless telephone in your office, they must
operate on different channels and be 20 feet apart. Press the channel key to
select a channel that provides the clearest communication.
Depending on your environment, the maximum number of cordless devices
used without interference varies.
Multiple base and handset units should not be closer than 20 feet at any time.
Radio interference causes interruptions in conversation. When this happens,
your unit is not defective. When noise continues, move to a different location
while you talk. (You might even need to move the base unit.) When the
situation persists, contact National Technical Assistance Center.
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D Cordless Lite II Owner's Guide
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