Blu BLUSPEED Manual Del Usuario página 19

Background sound: Setup the background sound for the current calling.
Mute: On selecting silence during a incoming call, the ringer will be
muted.
DTMF: Operations of DTMF powering on and off
Conference*: Enter multiple party conference call state. By following the
prompts, you can have the following functions: receive waiting calls, add
them into multiple party call, maintain the multiple party call, talk
privately with one party of the conference while maintaining all other
callers, connect one party in the call conference with another party while
exiting the multiple party call oneself, maintain one party of the multiple
party call and end current call and all other maintained calls.
Note: The menu marked * items will only appear in special
circumstances. For conference function, it is necessary to apply for
service supply to corresponding service operator.
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