Call routing
253
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
Description of the Procedure
Calls on hold in the exchange (Fig. 108):
• User is through to user B.
• User B puts user A on hold: The call is put on hold locally in the communication
server.
• User B calls user C: As soon as user B dials the external phone number; the com-
munication server transfers the locally held call to the exchange by activating
the Hold supplementary service with the network provider.
All the other three-party connections can be set up from this situation. Example
with brokering:
• User A is on hold in the exchange
•UserB is through to userC.
• User B brokers to user A:
As user A in the exchange is on hold, the communication server itself does not
broker; instead it requests the network provider to do so (by sending "hold" for
user B and "retrieve" for user A).
Fig. 109 Brokering followed by call transfer
Fig. 110 Enquiry call and brokering, followed by three-party conference
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