Aastra 400 Series System Manual page 254

Call routing
Prerequisites
The following requirements have to be met for three-party connections in the ex-
change to be activated:
• Basic accesses in point-to-multipoint operation (DSS1 only; QSIG and analogue
not supported).
• For Italy only: Basic accesses in point-to-point operation (DSS1 only; QSIG and
analogue not supported).
• The supplementary services required must be available at every basic access at
which the function is to be supported (subscription may be required).
• The enquiry call connection must be set up as an outgoing call by the internal
user. It has to be routed via the same basic access as the first connection.
• Authorisations must be enabled (see
Response of the Communication Server if the Procedure Fails in the
Exchange:
• Hold cannot be transferred to the exchange:
– The connection is put on hold in the communication server.
– Any subsequently initiated three-party services are carried out locally in the
communication server.
• Three-party conference / call transfer in the exchange not carried out:
The communication server cannot carry out the function locally as the call is on
hold in the exchange.
254
"System configuration", page
System functions and features as of R3.0
255).
syd-0367/1.3 – R3.0 – 03.2013