HP OpenCall SS7 Stack APIs

The Stack APIs provide access to the SS7 protocol stack. These APIs allow an application to request services from the appropriate protocol layer (MTP Level 3, SCCP or TCAP).

MTP3/M3UA API

MTP3/M3UA Level 3 services are accessible through this API. Using the provided functions, an application written in C can exchange MSUs with a peer application. Applications can utilize the functions provided by this API to request services such as:

Message Handling,
Network Management,
Link Management (MTP3 only).

See Chapter 4 “Using the Level 3 (MTP3/M3UA) API”, for a full description.

SCCP API

The SCCP library enhances the transport services of MTP Level 3, and combined with the MTP library forms the Network Service Part (NSP) which is equivalent to Layer 3 of the Open Systems Interconnection (OSI) reference model.

Applications written in C can utilize the functions provided by this API to request SCCP services such as:

Message Handling
Global Title Translation
Routing
Addressing
Signaling Point Management and Subsystem Management
Segmentation/Reassembly

See Chapter 5 “Using the SCCP API”, for a full description.

TCAP API

The TCAP API allows an application written in C to access either the component or the transaction sublayer. This enables non-standard TCAP components to use the HP OpenCall SS7 transaction sublayer.

This API provides functions to request the services of the TCAP library such as:

Exchange of TCAP components,
Multiple User Access,
Component Management,
Transaction/Dialog Management.

For a description, see Chapter 6 “Using the TCAP API”.

TCAP Application Message Dispatcher

If several users are connected with the same SSN on the same stack, you can supply your own algorithm to replace the round-robin algorithm used by default. You do this using the TCAP Application Message Dispatcher.

The TCAP Application Message Dispatcher has its own API. This API is described in Chapter 7 “Using the TCAP Application Message Dispatcher”.

ISUP API

HP OpenCall SS7 ISUP enables ISUP call control applications to run over SS7 networks. It relies on MTP Level 3 functionality to transfer its messages through the SS7 network to the destination point code.

For a description, see Chapter 12 “Using the ISUP API ” and subsequent chapters.

TUP API

HP Opencall SS7 TUP enables TUP call control applications to run over SS7 networks. It relies on MTP Level 3 functionality to transfer its messages through the SS7 network to the destination point code.

For a description, see Appendix B “TUP Addendum”