[cisco-voip] Location Question

Fri Oct 9 14:43:08 EDT 2009

I think the other 'bad' thing about CAC is that if you have two links, one primary and one backup, CAC has no idea to lower the number of calls. 

I _think_ RSVP is supposed to fix that but is very complex. Sorta like tax law. 

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Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
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----- Original Message ----- 
From: "Dennis Heim" <Dennis.Heim at cdw.com> 
To: "Matt Slaga (US)" <Matt.Slaga at us.didata.com>, "STEVEN CASPER" <SCASPER at mtb.com>, "Tanner Ezell" <tanner.ezell at gmail.com> 
Cc: cisco-voip at puck.nether.net 
Sent: Friday, October 9, 2009 2:41:04 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [cisco-voip] Location Question 

CallManager Locations based CAC and Network QoS are like 2 ships passing in the night. They know nothing about each other, but your end users will let you know if they don’t match.. J 

Dennis Heim 
Network Voice Engineer 
CDW Advanced Technology Services 
11711 N. Meridian Street, Suite 225 
Carmel, IN 46032 

317.569.4255 Office 
317.569.4201 Fax 
317.694.6070 Cell 

dennis.heim at cdw.com 
www.berbee.com 

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Matt Slaga (US) 
Sent: Friday, October 09, 2009 2:18 PM 
To: STEVEN CASPER; Tanner Ezell 
Cc: cisco-voip at puck.nether.net 
Subject: Re: [cisco-voip] Location Question 

It is calculated as 24 per call for locations. 240 in a locations should get you 10 calls. It does not calculate header compression ratios or anything like that, just simple math. Same as gatekeepers. You can watch the locations numbers in the RTM. 

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of STEVEN CASPER 
Sent: Friday, October 09, 2009 1:32 PM 
To: Tanner Ezell 
Cc: cisco-voip at puck.nether.net 
Subject: Re: [cisco-voip] Location Question 

You are way off base on your reply, since my question references the help screen here is a snippet from the help screen: 

    • G.729 call uses 24 kbps. 

    • GSM call uses 29 kbps. 

    • Wideband call uses 272 kbps. 

Note : Each call comprises two call streams. To improve audio quality, lower the bandwidth setting, so fewer active calls are allowed on the link to this location. 

Video 

Now of course 240 divided by 24 = 10. I am curious about the "Each call comprises two call streams". So is it 240 dived by 24 or 240 divided by 48. I would assume by 24 but why the comment about the two call streams then? 

>>> Tanner Ezell <tanner.ezell at gmail.com> 10/9/2009 12:52 PM >>> 
Funny, I remember seeing this question on a Cisco exam. 

Two things, 

1) It's a bad idea to ask questions off an exam here 

2) If you don't know that a G.729 call consumes about 24kbps in bandwidth, you should try harder. 

Cheers. 

On Fri, Oct 9, 2009 at 12:32 PM, STEVEN CASPER < SCASPER at mtb.com > wrote: 

This is a simple question I think but I want to make sure I understand what I am reading under the Location Configuration Settings Help Screen: 

I have a location with 240kb of bandwidth designated - how may g729 calls will this support? 

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