What does the acronym SRST stand for in networking?

The acronym SRST stands for Survivable Remote Site Telephony. This technology is primarily associated with Cisco and is designed to provide continuous telephony service to remote sites in the event of a WAN link failure. In situations where the main call control server (such as a Cisco Unified Communications Manager) becomes unreachable, SRST enables voice calls to be processed locally on the router, ensuring that calls can still be placed and received at the remote site.

This capability is critical for organizations that depend on uninterrupted communication and must maintain connectivity for users in remote locations. SRST supports essential features such as call routing, dial plans, and local extensions, allowing users to operate effectively even during network disruptions. It is part of a broader strategy to enhance the resiliency of voice communications in distributed environments, making it a vital consideration for enterprise networking specialists.

The other options do not pertain to established networking concepts related to telephony and survivability. They involve terms that aren't recognized or widely used in the context of networking, particularly with respect to Cisco's survivable telephony solutions.