Private Telecommunications Network (PTN); Signalling at the S-Reference Point Generic Feature Key Management Protocol for the Control of Supplementary Services
This Standard defines the Feature Key Management signaling protocol for the purpose of supplementary service control at an interface at the S reference point between a Terminal equipment (TE) and a Private Telecommunication Network (PTN). A PTN consists of one or more interconnected Private Telecommunication Network Exchanges (PTNXs)@ and therefore an Interface at the S reference point is actually between a TE and a PTNX. The S reference point is defined in Standard ECMA-133. The Feature Key Management protocol operates in conjunction with the signaling protocol specified in Standard ECMA-106 for circuit-switched call control. It is based on the use of the two information elements Feature activation and Feature indication. While the generic procedures associated with feature key invocation and indication are specified in this Standard@ the allocation of actual codes used to designee individual supplementary services is not standardized. This Standard is applicable to the user accesses of PTNs and to TEs which are intended for connection to PTNs.