ASCOM Ascotel 2025, Системное руководство

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ascom Ascotel 2025/2045/2065
HBT_20321104_02/B0_en Call Routing 2.185
Description of the Procedure
Calls on hold in the exchange ( Fig. 2.90 ):
• Subscriber A is through to subscriber B.
• Subscriber B puts subscriber A on hold: The call is put on hold locally in the
PBX.
• Subscriber A calls subscriber C: As soon as subscriber B dials the external
phone number; the PBX transfers the locally held call to the exchange by acti-
vating the hold supplementary service with the network provider.
All the other three-party connections can be set up from this situation. Example
with brokering:
• Subscriber A is on hold in the exchange.
• Subscriber B is through to subscriber C.
• Subscriber B brokers to subscriber A:
As subscriber A in the exchange is on hold, the PBX itself does not broker;
instead it requests the network provider to do so (by sending "hold" for
subscriber B and "retrieve" for subscriber A).
Fig. 2.91: Brokering followed by call transfer
Fig. 2.92: Enquiry call and brokering, followed by three-party conference
ISDN ISDN
A
C
B
PBX
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ISDN ISDN
A
C
B
PBX
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ISDN ISDN
A
C
B
PBX
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ISDN ISDN
A
C
B
PBX
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