ASCOM Ascotel 2025 System Manual page 362

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).
ISDN ISDN
A
C
Fig. 2.91: Brokering followed by call transfer
ISDN ISDN
A
C
Fig. 2.92: Enquiry call and brokering, followed by three-party conference
HBT_20321104_02/B0_en
PBX
B
haz1219aaena0
PBX
B
haz1221aaena0
ascom Ascotel 2025/2045/2065
ISDN ISDN
A
C
ISDN ISDN
A
C
PBX
B
haz1220aaena0
PBX
B
haz1222aaena0
Call Routing 2.185