UC520 is not letting another caller to be added to an existing conference call, when I try to add another person and hit conference it disconnects one of the callers from ongoing conference call. I have a 64 channel DSP installed.
The octo-line config won't come into play here
This config setting;
max-conferences 8 gain -6
relates to the number of simultaneous Conferences not the number of
Have a look at this excellent doc from Tony @ Cisco;