Aastra 400 Series System Manual page 248

Call routing
Two incoming calls
The B channels of two incoming calls can be connected with each other via a con-
ference circuit or by a normal call handover by going on-hook (transfer).
Tab. 80 Features supported
User A
Fig. 106 Connecting two incoming calls
Preventing pointless Exchange-to-Exchange Connections
To prevent exchange-to-exchange connections being set up with announcement
services or with special numbers (e.g. info boxes), the numbers concerned should
be barred in the digit barring.
248
Switching calls
Conference circuit
User C
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013