[cisco-voip] DSP configuration

[Lelio Fulgenzi]

I also wanted to note that 275 trunks seems like quite a few number of trunks. We have that many and I've been doing some analysis and have found that our trunk utilization has gone down significantly over the last two years. 

We have about 7500 devices, granted they are in two distinct demographic groups, business (day time use) and students (more evening use). 

How many phones do you have? Have you done a gateway utilization report recently? 


--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
"Bad grammar makes me [sic]" - Tshirt 


----- Original Message ----- 
From: "Nick Matthews" <matthnick at gmail.com> 
To: "Micah Bennett" <mbennett at als-xtn.com> 
Cc: "cisco-voip list" <cisco-voip at puck.nether.net> 
Sent: Tuesday, October 13, 2009 6:34:36 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [cisco-voip] DSP configuration 

The DSP calculator as mentioned is the tool you're looking for. 

But - your calculations are pretty close. 

Instead of thinking in dsp/call, you should think about call/dsp. 

The math here works like this: 
16 channels / DSP 
G711 - 16 calls per DSP 
G729 - 6 calls per DSP. 

If you were to switch it around, your calculations are 16 calls per 
DSP on G711, and 8 for G729. It's pretty close, but just close enough 
to cause problems. 

-nick 

On Tue, Oct 13, 2009 at 4:56 PM, Micah Bennett <mbennett at als-xtn.com> wrote: 
> Hello all 
> 
> 
> 
> Its been a while since our system deployment so I am trying to refresh 
> myself on the DSP / PVDM quantity I need for the number of trunks I have. 
> 
> 
> 
> I have 276 Trunks coming into my primary location. 
> 
> 
> 
> Primary location has call manager cluster and IPCC express cluster. 
> 
> 
> 
> We have two remote offices connected via MPLS. 
> 
> 
> 
> My IPCC cluster is configured for G711. 
> 
> 
> 
> Any calls we send to the remote offices get sent at G729 to save on the 
> bandwidth usage. 
> 
> 
> 
> If I recall, I need 1 DSP for every voice channel at G711 and 2 DSPs for 
> every voice channel at G729. 
> 
> So at a minimum I would have 276 DSPs + X (X being the max quantity of 
> trunks I expect to send out as G729). 
> 
> 
> 
> Also, all of the these DSPs (PVDM2-64) modules will be where every the voice 
> trunks are. 
> 
> 
> 
> Will I need any DSPs at the remote offices if no Voice trunks will be 
> terminated there? Any calls they initiate will come across the MPLS network 
> and go out from our primary location at G729. 
> 
> 
> 
> Micah Bennett 
> Telecommunications Admin 
> Active Outdoors 
> 
> 
> 
> _______________________________________________ 
> cisco-voip mailing list 
> cisco-voip at puck.nether.net 
> https://puck.nether.net/mailman/listinfo/cisco-voip 
> 
> 
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