Siemens Profiset 30isdn Operating Instructions Manual page 56

ISDN glossary
Service indicator
Standard rate access
System connection
Three-party conference
(3PTY)
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Western plug
48
A feature of ISDN. The service indicator, which is sent with every ISDN
connection, indicates the type of connection required. If the service in-
dicator of the calling terminal does not correspond to that of the called
terminal, the connection is not established.
Service package for ISDN features.
A particular type of ISDN connection. In the Euro ISDN, either the basic
rate acces or the primary rate access can be used for a system connec-
tion. The system connection is a point-to-point connection.
In a three-party conference, a user is simultaneously connected to two
other parties, whereby all three parties can speak to each other.
A special type of consultation whereby the two parties can be spoken
to alternately without interrupting the telephone connection.
TSI Abbreviation for "Terminal Selection Identifier" . Used for the old German
ISDN protocol 1TR6 (no longer widely used) to address a number to ter-
minals connected to the same basic rate access. Nowadays, MSNs are
used for this function.
General term for connectors with 4 or 6 contacts with analog terminals
and 8 contacts with ISDN terminals.