TonyH a TME at Cisco asked me to pass along another great document to the community. This one to help you configure Hardware Conferencing on CallManager Express and the UC520.
Software based conferencing is the default and only supports 3 parties per conference. With hardware based conferencing on CME you can support up to 8 parties per conference.
You just need the DSPs to do it!
Now after reading the attached guide you may ask me . . How many DSPs do the UC520s come with . .
Both the 8- and 16-user SKUs comes equipped with two (2) 5510 DSPs.
The 32- and 48-user SKUs both come equipped with four (4) 5510 DSP configurations.