For 3905, we need to buy:
Unified Communications Manager Basic License
UC Manager Essential License
Precisely UC Manager Essential License.
ref. - http://www.cisco.com/web/partners/downloads/partner/WWChannels/technology/ipc/downloads/ip_comm_og_ucl_based_1021.pdf
Table 4 - Device Support for TelePresence, Desktop Video, Enhanced, Basic, and Essential Licenses
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