Bosch Integral TS13 Operating Instructions Manual page 40

Isdn telephone. connected to integral 33 systems
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During a call
40
Several calls simultaneously "
Note:
You can set the volume of the handset and
loudspeaker individually for each connec-
tion.
The setting is retained for the duration of
the call.
When switching between several connec-
tions, each one keeps its own set values.
You can only change the basic settings
when the telephone is idle.

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