Cisco Emergency Responder Installation Overview
Cisco Emergency Responder (Emergency Responder) is distributed on an installation DVD that contains everything that is required to install Emergency Responder, including the CiscoUnifiedCommunications Operating System software.
You can upgrade to Emergency Responder Release 12.5 from Emergency Responder Release 8.5 or later. You cannot directly upgrade to Emergency Responder Release 12.5 from Emergency Responder Release 8.5 or earlier.