C2800nm+adventerprisek9+mz+152+1+t+bin — Exclusive

: Signifies that the image runs from RAM and is compressed (using zip).

: Enhanced Support for Cisco Unified Communications Manager Express (CME) and Survivable Remote Site Telephony (SRST). c2800nm+adventerprisek9+mz+152+1+t+bin

: This could represent a specific build or interim version within the 15.2 release. : Signifies that the image runs from RAM

: The "Advanced Enterprise Services" feature set. This is the most comprehensive package, combining high-end security (K9/encryption), voice, and advanced routing protocols (BGP, MPLS) into one image. combining high-end security (K9/encryption)

The 15.2(1)T release introduced more granular IP Service Level Agreement (SLA) probes, including TCP Connect and UDP Jitter with advanced statistical reporting. This allows legacy routers to actively monitor application performance.

Router# show version Cisco 2821 (revision 1.0) with 483328K/32768K bytes of memory.