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The SS7 ISUP (Integrated Services User Part) protocol is primarily focused on establishing, managing, and terminating telephone calls over the Public Switched Telephone Network (PSTN). One of its core functions is to facilitate the signaling required to set up and connect calls, ensuring that the communication path is properly established for voice transmission. This makes the option regarding protocols to connect calls over the PSTN a correct choice.

In addition to this, ISUP also provides services that include support for call management such as addressing, routing, and session management, which are essential in the signaling process. While some other options mention aspects of call and network management, they do not encompass the fundamental services specifically associated with ISUP's standardized implementation for call control in traditional telecommunication.

Choosing the right aspects of SS7 ISUP's functionality helps in understanding its pivotal role in facilitating voice communication and signaling between different exchanges in the PSTN infrastructure.