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Survivable Remote Site telephony (SRST)
A configuration that allows a router to act as a failover device if an IP phone is unable to reach a CUCM server
Feature License
a license dictating the number of IP phones a CME router is able to support.
Phone user license
A license belonging to each Cisco IP phone that allows it to communicate with CME or CUCM server; most newly purchased IP phones come with a phone user license.
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