I wanna what's Conference Max SESSION here meaning? Does it mean the qty of the conference(not the participant)? If yes, is it the qty under G711 or G729?
dspfarm profile 1 conference
associate application SCCP
maximum sessions 12
And, does MTP and transcode must be configed? also what's the meaning about the max session for MTP and Transcode?
That config you posted does not tell me what codecs you are using...
You will need to look under your dial-peers if you are using h.323 or under the region settings on your IP phones if you are using MGCP to know which codecs you are using.
To know the amount of dsps required for 12 conference sessions.. You can use the cisco dsp calculator to calculate this..
Its located here...
Finally for oyu to have 12 sessions configured that implies that you have enough dsps to handle them, otherwise cisco router will not allow you to configure this number of sessions if you do not have the required dsps