Private Integrated Services Network (PISN)
- Specification, Functional Model and Information Flows - Call
Intrusion Supplementary Service (CISD)
2nd edition (June 1997)
This Standard specifies the Call Intrusion supplementary service
(SS-CI), which is applicable to various basic services supported
by Private Integrated Services Networks (PISN). Basic services
are specified in ECMA-142.
Call Intrusion (SS-CI) is a supplementary service which, on request
from the served user, enables the served user to establish communication
with a busy called user (user B) by breaking into an established
call between user B and a third user (user C).
Supplementary service specifications are produced in three stages,
according to the method described in ETS 300 387. This Standard
contains the stage 1 and stage 2 specifications of SS-CI. The
stage 1 specification (clause 6) specifies the supplementary service
as seen by users of PISNs. The stage 2 specification (clause 7)
identifies the functional entities involved in the supplementary
service and the information flows between them.
For this Standard, stage 2 does not consider the split of functionality
between a functional terminal at user B and the local PINX. Terminal
functions and local PINX functions at user B are included in the
same Functional Entity.
The following file can be freely downloaded:
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||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 14845.
The previous replaced "historical" edition of this Ecma Standard is not available.