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.

Other protocols and interfaces

Protocols:

Interfaces:

ISUP over SIGTRAN

The ISDN User Part or ISUP is part of the Signaling System #7 which is used to set up telephone calls in Public Switched Telephone Networks. It is specified by the ITU-T as part of the Q.76x series.

When a telephone call is set up from one subscriber to another, many telephone exchanges will be involved, possibly across international boundaries. To allow a call to be set up correctly, where ISUP is supported, a switch will signal call-related information like called or calling party number to the next switch in the network using ISUP messages. Each timeslot between two switches is uniquely identified by a Circuit Identification Code (CIC) that is included in the ISUP messages. The exchange uses this information along with the received signalling information (especially the Called Party Number) to determine which inbound CICs and outbound CICs should be connected together to provide an end to end speech path.

In addition to call related information, ISUP is also used to exchange status information for, and permit management of, the available timeslots. In the case of no outbound CIC being available on a particular exchange, a release message is sent back to the preceding switches in the chain so a new route can be tried.

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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