Aastra Ascotel IntelliGate A150 System Manual page 210

System Functions and Features as of I7.9
Description of the Procedure
Calls on hold in the exchange
• 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).
ISDN ISDN
A
C
Fig. 92 Brokering followed by call transfer
ISDN ISDN
A
C
Fig. 93 Enquiry call and brokering, followed by three-party conference
210
(Fig. 91, page
PBX
B
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PBX
B
haz1221aaena0
209):
ISDN ISDN
A
C
ISDN ISDN
A
C
PBX
B
haz1220aaena0
PBX
B
haz1222aaena0
Call routing