switel DE183 Bedienungsanleitung Seite 137

Conference calls
An external call can be transferred to another internal handset for a conference call.
HS1: I, e.g. 2
HS2: ƒ
HS1: 2 sec #
HS1/HS2: ƒ
Dial the internal call number of the handset
required during the external call
Take the internal call on the other handset
Start the conference facility
End the conference call
Telephoning
137