Hi Christian, Migration from 5.3 to 7.x or 8.x is not supported, you will need to upgrade the system at least to MP 6.0 MR5. http://docwiki.cisco.com/wiki/Cisco_Unified_MeetingPlace%2C_Release_7.0_--_About_Migration http://docwiki.cisco.com/wiki/Cisco_Unified_MeetingPlace_Release_8.0_--_System_Requirements_for_Cisco_Unified_MeetingPlace_Release_8.0#Upgrading_and_Migration_Requirements Audio server 8106 is not used with MP 7.x/8.x. For audio conferencing, you will need MCU 3515/3545, or if you decide to go for MP 8.x, you might consider installing application server with express media server. HTH, Natasa
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