M3UA service users

The M3UA data interface supports one or more applications using network service access points (NSAPs). One NSAP is defined for each application that uses the M3UA service. An application binds to a particular NSAP at initialization time, specifying the NSAP ID to which it wants to bind. Each NSAP is associated with a service information octet (SIO) value, which in turn identifies the upper task protocol in use on that NSAP (for example ISUP, TUP, SCCP). Therefore, only one application process can handle incoming messages for a particular upper task protocol (only one process receiving incoming ISUP messages).

The M3UA configuration file specifies the number of upper NSAPs and the characteristics of each upper NSAP. For information, see M3UANsapCfg and the Dialogic® NaturalAccess™ Signaling Software Configuration Manual.