Aastra 400 Series, System Manual, Page: 252 / 592

Call routing
252 System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
6. 7. 3 Three-Party Connections in the Exchange
A locally implemented three-party connection with two external users takes up
two B channels.
In point-to-multipoint operation the system can be configured so that the node of
such a three-party connection is transferred from the communication server to the
public network, thereby freeing up at least one B channel and other system re-
sources. To do so the system accesses the supplementary services of the network
provider.
The users themselves are not aware of this process.
The following system features can be transferred to the exchange:
Tab. 82 Supplementary services take charge of features transferred to the exchange
Fig. 108 External connection followed by hold and enquiry calls
System feature Supplementary service Feature description
Hold Hold see page 399
Enquiry Inquiry Call see page 400
Brokering Brokering see page 402
Call transfer (with or without prior notice) Explicit Call Transfer see page 409
Call back
(only after call transfer with prior notice) Recall see page 467
Three-party conference Three-Party Conference see page 404