Private Integrated Services Network (PISN)
- Inter-Exchange Signalling Protocol - Call Intrusion Supplementary
4th edition (December 2001)
This Standard specifies the signalling protocol for the support of the Call Intrusion supplementary service (SS-CI) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN).
SS-CI is a supplementary service which, on request from the calling user, enables the calling user to establish communication with a busy called user by breaking into an established call between the called user and a third user (unwanted user).
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 in ECMA-202.
The signalling protocol for SS-CI operates 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-CI 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:
||1 163 401
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 14846.
The previous replaced "historical" editions of this Ecma Standard are available here.