Bosch Integral TS13 Operating Instructions Manual page 42

During a call
Conference: You can speak to two parties simultaneously.
You can put one of the conference partners temporarily on hold if you wish to speak
to the other partner separately.
Talking to two parties simultaneously (Conference)
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Speaking to one conference party only
'Interchange usersµ
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You are talking to someone. Initiate the
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refer-back using the "Refer-back" key.
Enter the number of the second conference
party.
You can initiate the conference as soon as
your are connected to both parties.
Select the menu item "Conference". You
'Conferenceµ
can speak to both parties simultaneously.
The conference is shown on the display.
All parties involved can speak to each
other directly.
Select the menu item "Interchange users"
to display the desired conference partner.
Press the "Refer-back" key.
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You can now speak to the specified party
alone. The other partner is on hold.
Several calls simultaneously "