How is it possible to increase capacity of transcoder sessions?
"webstd.design" is right by saying increasing your dsp resources but if you are simply referring to altering the sessions, you can do that from your router configuration under the dspfarms. The word "Capacity" is pretty broad.
first check the dsp resources " show voice dsp". If you have more, then simply go under your transcoder dspfarm and alter the maximum sessions.
dspfarm profile 10 transcode
maximum sessions 5
By installation of additional DSP modules.