System Functions and Features as of I7.9
210 Call routing
syd-0200/3.0 – I7.9 – 11.2009
Description of the Procedure
Calls on hold in the exchange (Fig. 91, page 209):
• User is through to user B.
• User B puts user A on hold: The call is put on hold locally in the PBX.
• User B calls user C: As soon as user B dials the external phone number; the PBX
transfers the locally held call to the exchange by activating the Hold supplemen-
tary 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
• User B is through to user C.
• User B brokers to user A:
As user A in the exchange is on hold, the PBX itself does not broker; instead it re-
quests the network provider to do so (by sending "hold" for user B and "retrieve"
for user A).
Fig. 92 Brokering followed by call transfer
Fig. 93 Enquiry call and brokering, followed by three-party conference
ISDNISDN
A
C
B
PBX
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ISDNISDN
A
C
B
PBX
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ISDNISDN
A
C
B
PBX
haz1222aaena0
ISDNISDN
A
C
B
PBX
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