I am trying to implement hardware conferencing in an environment that uses multiple codecs. My understanding is that a CM software conferencing bridge only supports G711 codec and puts overhead on the server, so I am looking to use a hardware conferencing bridge i.e. a DSP resource on a 3845 router. I need to be able to support 1 conference of up to 16 participants. I have a couple of questions.
1. Can you point me to a pre-existing example configuration or instructions for configuration?
2. Is SCCP required for the hardware conferencing bridge to work?
3. Can hardware conferencing support 16 participants? I have read on this forum that the maximum is 8 but have also read a document stating the maximum is 16.
A DSP farm that is configured for conferencing and G.711 provides 8 conferences. When configured to accept both G.711 and G.729 calls, a single DSP provides 2 conferences because it is also reserving its resources for performing transcoding of streams.
So with G.711/G.729 each DSP will provide 2 conferences with each conference session supoorting 8 0r 32 participants depending on your IOS.
Assuming your IOS supports 8 participants, then with a single dsp..you will have 2*8= 16 streams. So yes your config will be fine.
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There are two types of hardware conferencing Ad-Hoc and Meet-Me conferencing. With Adhoc conferencing you are right max is 8 participants (codec supported are g.711/g.729a/g.729). But if you use Meetme conferencing with multiple codec your max is 1 conference with 16 participants per DSP. You can add more PVDM2-64 (your model supports 4 DSP slots) and that will give you a second Meet-me conference with 16 participants but unfortunately you can not mixed or combine 2 dsp's for one conference. If you use pure g.711 codec you'll get the max 64 participants per DSP.
Reference: CME4.1 Hardware Conferencing Tech Tips (May 15, 2007) by Tony Huynh
I know reference is for CME 4.1 and 2 years old but I use it to configure my CME 7.1. good luck I hope that answers your question.
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