Aastra Ascotel IntelliGate 2025 - Page 332

Ascotel IntelliGate 2025/2045/2065
332 Call Routing Part 2
Fig. 2.90: External connection followed by hold and enquiry calls
Description of the Procedure
Calls on hold in the exchange (Fig. 2.90):
• Subscriber is through to subscriber B.
• Subscriber B puts subscriber A on hold: The call is put on hold locally in the PBX.
• Subscriber B calls subscriber C: As soon as subscriber B dials the external phone
number; the PBX 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:
• 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 sub-
scriber B and "retrieve" for subscriber A).
Fig. 2.91: Brokering followed by call transfer
ISDNISDN
A
B
PBX
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ISDNISDN
A
C
B
PBX
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ISDNISDN
A
C
B
PBX
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ISDNISDN
A
C
B
PBX
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