User`s manual

Operation
Options while on calls
Flash/call waiting
If you subscribe to call waiting service offered by your telephone 
service provider, you will hear a call waiting alert tone if someone 
calls you while you are in the middle of a call.
If the incoming call is from the same line of the current call:
Press FLASH on the speakerphone to put 
your current call on hold and answer the 
new call. 
Press FLASH again at any time to switch 
back and forth between calls.
For the multi-line telephone system, if the incoming call is 
from a different line of the current call:
Press FLASH on the speakerphone to put your current call on 
hold. This does not pick up the new call from another line.
Press  PHONE on the speakerphone to end the current call, 
then press  PHONE again when the speakerphone rings to 
answer the incoming call from another line. 
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