INAP over TDM:

The Intelligent Network Application Part (INAP) is a signalling protocol used in the intelligent network architecture. It is part of the SS7 protocol suite, typically layered on top of TCAP. The ITU defines several "capability levels" for this protocol, starting with Capability Set 1 (CS-1). A typical application for the IN is a Number Translation service.

The Telephone exchange uses TCAP, SCCP and INAP and in IN terms is a Service Switching Point. It sends an INAP Initial Detection Point (IDP) message to the Service Control Point. The SCP returns an INAP Connect message, which contains a geographic number to forward the call to. INAP messages are defined using ASN.1 encoding. SCCP is used for the routing. Extended form of INAP is Customized Applications for Mobile Enhanced Logic. TCAP is used to separate the transactions into discrete units.

Time-Division Multiplexing (TDM) is a type of digital multiplexing in which two or more signals or bit streams are transferred apparently simultaneously as sub-channels in one communication channel, but are physically taking turns on the channel. The time domain is divided into several recurrent timeslots of fixed length, one for each sub-channel.

Other protocols and interfaces

Protocols:

Interfaces:

INAP over SIGTRAN:

The Intelligent Network Application Part (INAP) is a signalling protocol used in the intelligent network architecture. It is part of the SS7 protocol suite, typically layered on top of TCAP. The ITU defines several "capability levels" for this protocol, starting with Capability Set 1 (CS-1). A typical application for the IN is a Number Translation service.

The Telephone exchange uses TCAP, SCCP and INAP and in IN terms is a Service Switching Point. It sends an INAP Initial Detection Point (IDP) message to the Service Control Point. The SCP returns an INAP Connect message, which contains a geographic number to forward the call to. INAP messages are defined using ASN.1 encoding. SCCP is used for the routing. Extended form of INAP is Customized Applications for Mobile Enhanced Logic. TCAP is used to separate the transactions into discrete units.

SIGTRAN is the name given to an Internet Engineering Task Force (IETF) working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for SS7 and ISDN communications protocols. SIGTRAN is logically an extension of the SS7 protocol family. It supports the same application and call management paradigms as SS7 but uses an IP transport called Stream Control Transmission Protocol (SCTP) as its underlying transport vehicle. Indeed, the most significant protocol defined by the SIGTRAN group was SCTP, which is used to carry PSTN signaling over IP. For more information on SIGTRAN, refer to RFC 2719: Architectural Framework for Signaling Transport. RFC 2719 also defines the concept of a Signaling Gateway (SG), which converts CCS messages from SS7 to SIGTRAN. Implemented in a variety of network elements including soft switches, the SG function can provide significant value to existing common channel signaling networks, leveraging investments associated with SS7 and delivering the cost/performance values associated with IP transport.



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