ASCOM Ascotel 2025 System Manual page 352

Setting up Exchange-to-Exchange Connections
An exchange-to-exchange connection can be set up using call diversion, confer-
ence, call forwarding and transfer with or without prior notice.
A
624 45 67
C
647 22 16
T Transfer
C Conference
CD Call diversion
CF Call forwarding
Fig. 2.85: Exchange-to-exchange traffic
Clearing down Exchange-to-Exchange Connections
The public network sends the PBX a release signal once the external call partners
of an exchange-to-exchange connection have finished the call. The connection is
then cleared down by the PBX.
Without a release signal, the PBX cannot clear down an exchange-to-exchange
connection.
The amount of time between completion of the call and the sending of the release
signal depends on whether the exchange-to-exchange connection is set up end-
to-end within the ISDN network (end-to-end ISDN connection) or whether sec-
tions of it are analogue (non-end-to-end ISDN connection).
At transitions to other networks (for example from leased-line-network to cellular
network) it is possible, due to the lack of correct signalling, that an end-to-end
ISDN connection is signalled as a non-end-to-end connection.
End-to-End ISDN Connection
The release signal is sent as soon as the call is completed.
HBT_20321104_02/B0_en
624 22 02
ascom Ascotel 2025/2045/2065
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T, C
T / T2
CF
CD
624 2x xx
B
202
624 22 02
Call Routing 2.175