Features of MTP3

Message Handling

The processing of MTP3 transfer requests and indications is handled as described in ITU-T Q.703 and ANSI T1.111.1. The functions that support this Message Signaling Unit (MSU) processing include:

Multiple Application Connections

MTP3 can accept multiple connections on the same user part (ISUP, SCCP or others). You can therefore build software redundancy into the system. One connection is active and handles the traffic, the other connection(s) are secondary and do not handle traffic. You can only have one primary connection per connection identifier, whereas you may have several secondary connections. You can set it so that the standby connections take over the primary connection. See the cnx_info parameter of the call “Creating MTP3 Stack Connections with SS7_xifcreate()” for more information.

Network Management

The HP OpenCall SS7 signaling network management provides procedures and functions required to maintain signaling services, and to restore normal signaling conditions in the event of disruption in the signaling network, either in signaling links or at signaling points.

These management functions include:

Traffic Management

In the case of congestion, HP OpenCall SS7 MTP3 uses signaling traffic management functions to divert traffic from signaling links or routes, or to reduce the amount of traffic on signaling links.

Traffic management functions include:

Link Management

Locally connected signaling links are controlled by the signaling link management functions. These functions provide the possibility to establish and maintain a certain predetermined capability of a linkset. Thus, in the event of signaling link failures, the signaling link management function controls the actions aimed at restoring the capability of the linkset.

Link management functions include:

Route Management

The signaling route management functions ensure a reliable exchange of information about the availability of signaling routes.

Combining Linksets

The HP OpenCall SS7 software can use combined linksets to share the traffic load if failures occur (according to ANSI T1-111-4 1998). A combined linkset is a set of linksets constituting routes of the same priority leading to a given destination. When there are one or more alternative signaling links available in the combined linkset to which the unavailable link belongs, the signaling traffic is transferred within the combined linkset.