Private Integrated Services Network (PISN)
- Inter-Exchange Signalling Protocol - Call Completion Supplementary
4th edition (December 2001)
This Standard specifies the signalling protocol for the support
of the Call Completion supplementary services at the Q reference
point between Private Integrated services Network eXchanges (PINXs)
connected together within a Private Integrated Services Network
(PISN). The Call Completion supplementary services are Completion
of Calls to Busy Subscribers (SS-CCBS) and Completion of Calls
on No Reply (SS-CCNR).
SS-CCBS enables a calling User A, encountering a busy destination
User B, to have the call completed when User B becomes not busy,
without having to make a new call attempt.
SS-CCNR enables a calling User A, encountering a destination
User B that, though alerted, does not answer, to have the call
completed when User B becomes not busy again after a period of
activity, without having to make a new call attempt.
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-CCBS and SS-CCNR operate on top
of the signalling protocol for basic circuit switched call control,
as specified in ECMA-143, and uses
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-CC and other supplementary services and ANFs.
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:
||1 189 194
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 13870.
The previous replaced "historical" editions of this Ecma Standard are available here.