Clearing Down Exchange-To-Exchange Connections - Aastra Ascotel IntelliGate A150 System Manual

5. 7. 1. 2

Clearing down Exchange-to-Exchange Connections

Digital-Digital (D-D):
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 sections
of it are analogue (non-end-to-end ISDN connection).
At transitions to other networks (for example from leased-line-network to GSM net-
work) 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.
Non-End-to-End ISDN Connection
With non-end-to-end ISDN connections the amount of time between the comple-
tion of the call and the release depends on who set up the connection:
• If the connection was set up by the PBX user (i.e. from the PBX's viewpoint an
outgoing call), and the external partner (user C in
can take a few minutes for the release signal to be sent.
• If the connection was set up by one of the external partners (i.e. from the PBX's
viewpoint an incoming call) and the external partner (user B in
hangs up, the release signal is sent immediately.
Note:
If two announcement services such as sports and weather information
are connected with each other, this exchange-to-exchange connection
will not be cleared down automatically This can lead to high call charges.
Each exchange-to-exchange connection will be cleared down by the PBX after two
hours.
Call routing
System Functions and Features as of I7.9
Fig. 86, page 200) hangs up, it
Fig. 86, page 200)
201