<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Verdana; font-size: 10pt; color: #000000'>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.<br><br>We have about 7500 devices, granted they are in two distinct demographic groups, business (day time use) and students (more evening use).<br><br>How many phones do you have? Have you done a gateway utilization report recently?<br><br><br>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>"Bad grammar makes me [sic]" - Tshirt<br><br><br>----- Original Message -----<br>From: "Nick Matthews" <matthnick@gmail.com><br>To: "Micah Bennett" <mbennett@als-xtn.com><br>Cc: "cisco-voip list" <cisco-voip@puck.nether.net><br>Sent: Tuesday, October 13, 2009 6:34:36 PM GMT -05:00 US/Canada Eastern<br>Subject: Re: [cisco-voip] DSP configuration<br><br>The DSP calculator as mentioned is the tool you're looking for.<br><br>But - your calculations are pretty close.<br><br>Instead of thinking in dsp/call, you should think about call/dsp.<br><br>The math here works like this:<br>16 channels / DSP<br>G711 - 16 calls per DSP<br>G729 - 6 calls per DSP.<br><br>If you were to switch it around, your calculations are 16 calls per<br>DSP on G711, and 8 for G729. It's pretty close, but just close enough<br>to cause problems.<br><br>-nick<br><br>On Tue, Oct 13, 2009 at 4:56 PM, Micah Bennett <mbennett@als-xtn.com> wrote:<br>> Hello all<br>><br>><br>><br>> Its been a while since our system deployment so I am trying to refresh<br>> myself on the DSP / PVDM quantity I need for the number of trunks I have.<br>><br>><br>><br>> I have 276 Trunks coming into my primary location.<br>><br>><br>><br>> Primary location has call manager cluster and IPCC express cluster.<br>><br>><br>><br>> We have two remote offices connected via MPLS.<br>><br>><br>><br>> My IPCC cluster is configured for G711.<br>><br>><br>><br>> Any calls we send to the remote offices get sent at G729 to save on the<br>> bandwidth usage.<br>><br>><br>><br>> If I recall, I need 1 DSP for every voice channel at G711 and 2 DSPs for<br>> every voice channel at G729.<br>><br>> So at a minimum I would have 276 DSPs + X (X being the max quantity of<br>> trunks I expect to send out as G729).<br>><br>><br>><br>> Also, all of the these DSPs (PVDM2-64) modules will be where every the voice<br>> trunks are.<br>><br>><br>><br>> Will I need any DSPs at the remote offices if no Voice trunks will be<br>> terminated there? Any calls they initiate will come across the MPLS network<br>> and go out from our primary location at G729.<br>><br>><br>><br>> Micah Bennett<br>> Telecommunications Admin<br>> Active Outdoors<br>><br>><br>><br>> _______________________________________________<br>> cisco-voip mailing list<br>> cisco-voip@puck.nether.net<br>> https://puck.nether.net/mailman/listinfo/cisco-voip<br>><br>><br>_______________________________________________<br>cisco-voip mailing list<br>cisco-voip@puck.nether.net<br>https://puck.nether.net/mailman/listinfo/cisco-voip<br></div></body></html>