During WAN outages, which feature enables continued local call processing at remote sites?

During WAN outages, which feature enables continued local call processing at remote sites?

• A. DNS SRV
• B. CUBE
• C. SRST
• D. Informix SQL

Answer: (C)

Survivable Remote Site Telephony lets a remote site keep working by taking over call processing locally when the WAN link to the central call-control server is lost. It runs on the local router (or CME/CUCM Express) and allows IP phones at the remote site to register and be served by the local call-processing engine. The router provides a local dial plan, handles signaling, and connects to a local PSTN gateway so users can place and receive calls within the site and to external numbers even without the central call manager. When the WAN link comes back, devices re-establish with the central controller without user action. This is precisely what enables continued local call processing during outages, unlike DNS SRV (service discovery), CUBE (border/trunking at the border, not local survivability), or Informix SQL (a database).

Survivable Remote Site Telephony lets a remote site keep working by taking over call processing locally when the WAN link to the central call-control server is lost. It runs on the local router (or CME/CUCM Express) and allows IP phones at the remote site to register and be served by the local call-processing engine. The router provides a local dial plan, handles signaling, and connects to a local PSTN gateway so users can place and receive calls within the site and to external numbers even without the central call manager. When the WAN link comes back, devices re-establish with the central controller without user action. This is precisely what enables continued local call processing during outages, unlike DNS SRV (service discovery), CUBE (border/trunking at the border, not local survivability), or Informix SQL (a database).