SRST is an IOS router feature at the branch. E-SRST however runs on a SRE module at the central site.
In a nut shell, E-SRST builds on top of SRST by automatically synchronizing user, phone, hunt group, partitions etc from CUCM to CME. Any change on CUCM is propagated to the branch sites without admin intervention, so when the WAN is down, the phone resembles the last changes done on CUCM.
Also,
E-SRST requires the routers at the branches to run CME-as-SRST.CME-as-SRST has detailed phone configs, that can be sync'ed from the central site.
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Whatever level you reach getting better never stops -- Sachin Tendulkar
Whatever level you reach getting better never stops -- Sachin Tendulkar
