[cisco-voip] Newb Question about conferencing?

[Ryan Ratliff]

IIRC this depends on what your max conference participants parameter is set to.  
Conference resources are not dynamic.  When a conference is started it will only happen if there is a resource that can handle the max number of participants for that conference.  In your example I would expect that the second conference gets created on the software CFB rather than on the DSPFarm (assuming 12 party max conference size).  

"A conference based on these DSPs allows a maximum of 8 participants. When a conference begins, all 8 positions are reserved at that time. Starting with Cisco IOS Release 12.4(15)T, this limit on the maximum number of participants has been increased to 32. "
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/media.html#wp1046210

A takeaway from this is to always define max-sessions on your DSPFarms in increments of the max number of conferences you allow, to avoid wasting DSPs.

-Ryan

On Dec 16, 2010, at 10:07 AM, Scott Voll wrote:

Follow up question:

I have an IOS VGW with DSP Conference resources (for the benefit of discussion we will say 20 streams)  and I have CM set as a Conference resource.  both in the MRG.

Now I place a 12 party Conf call (Should take 12 streams from the VGW).  Then we place a second Conf call of 6.  This should leave me with two streams available on the VGW.  What happens if I start a meetme conference Second person dials in.  What happens to the third call?

A.  Call Fails
B. Conf Call cascades to the CM Conf resource.
C. The streams previously on the VGW move over to the CM Conf Resource and continues
D.  Cisco really has some other wacked way of doing things ;-)  Please describe.

I just want to understand how things work.

Thanks

Scott

On Wed, Dec 15, 2010 at 10:58 AM, Scott Voll <svoll.voip at gmail.com> wrote:
I have set CM parameter to 12 for Meetme conferencing.

I have set my VGW SCCP profile to max session 12.

Question.  is that 12 Total participates or 12 per Conference?

What if I use the CM Conference resource.  Does that change?

TIA

Scott

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