### Key Features Maintained During FallbackWhile SRST doesn't offer the full suite of complex features found in a central CUCM, it maintains "business-critical" functions:
If you encountered this term in a log file or a specific patch note, it may refer to a custom implementation or a typo for (Linux Kernel memory) or SReclaim . srst fallback
is for the IP Phones . It gives the phones a place to register so they can still make calls. srst fallback