[cisco-voip] Maximum Ad Hoc Conference with 6608 and 4.1(2)

[Scott Crosby]

The conferencing capabilities of CallManager along with their hardware
DSP resources haven't expanded much. Supposedly, you can set parameters
higher than 6 but Cisco TAC doesn't support it. I believe the issue with
the hardware DSP resources of the 6608 or an HDV-DSP farm module in a
IOS router is that audio mixing can't cross DSP modules inside the
platforms. That's what limits the max conference users. When the
conference parameter is upped on the software conference bridge on
CallManager it can mix more than six but the higher you set the value
the more processing impact it has on that CallManager. Hence the lack of
TAC support for it, from what I understand. Also the software conference
bridge only supports the G711 codecs without a hardware transcoding
resource. Also the software conference bridge on CallManager can't cross
servers to provide additional mixing so the conference has to live on
one server or the other at the time it starts.

 

I believe the parameter you are looking are in Service>>Service
Parameters>> Cisco CallManager>> Maximum Ad Hoc Conference. The default
value is four. 

 

Cisco does offer a full fledged enterprise conferencing solution to meet
the needs of your users. It's called Meeting Place, it's the Ferrari of
conferencing but it's got a Ferrari price.

 

Meeting Place

http://www.cisco.com/en/US/products/sw/ps5664/ps5669/

 

I think Cisco also still sells Cisco Conferencing Connection. It's
between CallManager native conferencing and Meeting Place. It very
limited, only supports G711 and in my opinion very buggy with poor
support from the TAC. I used to work for a premier integrator of Cisco
IP Telephony solutions who deployed this for a customer. We didn't
deploy it ever again.

 

Cisco Conferencing Connection

http://www.cisco.com/en/US/products/sw/voicesw/ps752/

 

 

--Scott

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Wednesday, February 16, 2005 1:45 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Maximum Ad Hoc Conference with 6608 and 4.1(2)

 

I can see plain and simple from this link
<http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_
administration_guide_chapter09186a008013937b.html#xtocid10>  , that the
maximum number of conference participants per conference call is six for
v3.3(2).

 

			 


			Conferencing Design Details


			The following points summarize the design
capabilities and requirements of the CiscoCatalyst voice modules:

			*	Support exists for a maximum of six
participants per conference call.

 

However, the documentation for 4.1(2) is not as clear.

 

Does anyone have any idea what the maximum number of participants for a
6608 DSP is with 4.1(2)? Can you point me to the documentation that
helps you come to this number?

 

According to this link
<http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administr
ation_guide_chapter09186a00802e0692.html#wp1023249> , it seems the
maximum is 16.

 

*	For a G.711 or G.723 conference-32 conferencing participants per
physical port; maximum conference size of 16 participants 

I am looking for the maximum value to enter in theMaximum Ad Hoc
Conference CallManager service parameter.

 

 

------------------------------------------------------------------------
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Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)

"That's a UNIX book. Cool!" -- Garth 
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