Panasonic KX-NT700 Operating Instructions Manual page 44

Using a Portable Station (PS) or Computer
•
For best performance, do not change the
speaker (receiver) volume of the PS frequently
during a call. Echoing or feedback may occur.
•
The microphone and receiver of the PS cannot
be used while the PS is connected to the unit.
•
This feature will not function when a mobile
phone or incompatible PS is connected to the
unit.
44 Operating Instructions Document Version 2010/02