You need to purchase:
1) SD-card S, M or L type - depending of capacity you need for recording
2) DSP-card S, M or L type - depending of DSP-resources you need: to CallRecording and other services, such as IP-trunks adn IP-Extensions, OGM, conference-ways etc.
3) Activation keys for UM-channels - depending of simultaneous requests to UM system you need to serve (call recording, voice mail etc)
4) Activation Keys (AK) for Call recording:
. a) NSU3xx - for call recording with manual activation by user - 1 AK per user AND/OR
. b) NSU002 - for automatic call recording (2-WayRec Control for Manager) - 1 AK per system
5) [Optional] NSU003 - AK for UM Messages BackUp - it lets you to make backups of recorded conversations in automatic mode (by shedule) to NAS/PC or USB-flash.