C2921-cme-srst/k9 is a cisco 2921 router bundled with voice bundle w/pvdm3-16, fl-cme-srst-25, uc license pak.
when unified cme is used in srst mode, it provides more call processing features for the ip phones than those are available with the srst feature on a router. in addition, to the srst features such as call preservation, auto-provisioning, and failover, unified cme in srst mode also provides most of the unified cme telephony features for the sccp phones, including:
☆ paging
☆ conferencing
☆ hunt groups
☆ basic automatic call distribution (b-acd)
☆ call park, call pickup, call pickup groups
☆ overlay-dn, softkey templates
☆ cisco ip communicator
☆ cisco unified video advantage
☆ integration with cisco unity with mwi support at remote sites, with distributed microsoft exchange or ibm lotus domino server