Per the Cisco Unified Communications Manager System Guide, Release 8.5(1) the maximum number of audio streams for G.711 is 128. This means G.711 software conferencing can support up to any combination of conference(s) equaling 128 users (eg. 1 conference of 128, or 3 conferences of 48 participants). However, the default is set to 48 and it is NOT recommended that you increase that number if you are running both the Cisco IP Voice Media Streaming Application service on the same server as the Cisco CallManager service.
When reviewing the maximum number of conferences on CUCM Service Parameters, the Call Count maximum is actually 256, rather than the max of 128 listed in the System Guide documentation.
G.711 is the only codec supported at default. You can modify this setting within Cisco Unified CM Administration by going to System > Service Parameters, selecting the server and then selecting the Cisco IP Voice Media Streaming App. You can add additional Supported MOH Codecs (711 mulaw, 711 alaw, 729 Annex A, wideband). If you select G729 (729 Annex A), a warning pops up stating that “this codec is optimized for speech, and the audio fidelity of music is marginal”.
To set the maximum participants for any single Ad Hoc and MeetMe Conference, go to the conference section with the CUCM Service Parameters. The default is 4 maximum participants for a single Ad Hoc or MeetMe conference which is low.
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