Private Integrated Services Network (PISN)
- Inter-Exchange Signalling Protocol - Do Not Disturb and Do Not
Disturb Override Supplementary Services (QSIG-DND(O))
4th edition (December 2001)
This Standard specifies the signalling protocol for the support
of the Do Not Disturb and Do Not Disturb Override supplementary
services (SS-DND and SS-DNDO) at the Q reference point between
Private Integrated services Network eXchanges (PINXs) connected
together within a Private Integrated Services Network (PISN).
SS-DND is a supplementary service which enables a served user
to cause the PISN to reject any calls, or just those associated
with a specified basic service, addressed to the served user's
PISN number. The calling user is given an indication. Incoming
calls are rejected as long as the service is active. The served
user's outgoing service is unaffected.
SS-DNDO is a supplementary service which enables a served user
to override SS-DND at a called number; that is, to allow the call
to proceed as if the called user had not activated SS-DND.
The Q reference point is defined in ECMA-133.
Service specifications are produced in three stages and according
to the method specified in ETS 300 387. This Standard contains
the stage 3 specification for the Q reference point and satisfies
the requirements identified by the stage 1 and stage 2 specifications
The signalling protocols for SS-DND(O) operate on top of the
signalling protocol for basic circuit switched call control, as
specified in ECMA-143, and use certain
aspects of the generic procedures for the control of supplementary
services specified in ECMA-165.
This Standard also specifies additional signalling protocol requirements
for the support of interactions at the Q reference point between
SS-DND and other supplementary services and ANFs and between SS-DNDO
and other supplementary services and ANFs.
Additional interactions that have no impact on the signalling
protocol at the Q reference point can be found in the relevant
stage 1 specifications.
This Standard is applicable to PINXs which can interconnect to
form a PISN.
The protocol defined in this Standard forms part of the PSS1
protocol (informally known as QSIG).
The following file can be freely downloaded:
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||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 14844.
The previous replaced "historical" editions of this Ecma Standard are available here.