in case of a conference of 4 CCM participants , as known the 4 streams are mixed and what reaches each participant is the 4 streams minus his own stream, then:
1: who should do the conference for a best practice, i mean to let it be a software based (on CCM)? or HW based? and if HW on what gateway this conference should be done, assume that each participant is in a remote site and the mixed call will be streamed over wan link.
2: if the 4 streams are of g729 then is the resulting mixed stream also g729 with a BW condidered as 24k (or around due to overheads)?