assume that i have multisites model with centralized CCM cluster, i want to use for conference brigdes only the software resource available on the CCM (IP Voice Media Streaming Service) and initially i don't want to use any HW resources for conferencing, now if a user in a remote site adds lets say one participant from HQ and 2 participants from two different remote sites, so this conference will be on net using SW resource available on CCM, assume g729 codec, my question is that what is the BW for this mixed stream of conferenced call, is it 1 g729 or (3*g729)?
A voice call is a full duplex stream. When you say you are consuming 80k of bandwith you are saying that you have 80k from User A to User B AND 80k from User B to User A.
When you buy WAN link from a provider you ask for X kbps amount of bandwith and usually this mean (exept on asymetric lines such as ADSL) that you got X kbps upstream and XKbps downstream.
For a CCM a single full dublex on G711 consume 80K.