[cisco-voip] Voice Gateway router size

[gr11]

Thanks  Lelio and all.

Yeah i meant to say ISR G2 sizes. I will try finding and using the Erlang
calculator. Does anyone has the link from Cisco, Lelio is referring to.

Thanks

On Wed, Nov 23, 2011 at 10:53 AM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

> The key value you need here is utilization. The number of people or phones
> at a site isn't the best number to use since it may not reflect how much
> they use off-net resources. If you have access to records off the current
> PBX, this will give you a better idea. Once you have these numbers, you can
> use Erlang calculations to let you know how many PRIs (and if billed
> separately, how many active channels) you will need. Someone recently
> posted a link to a Cisco doc that summarizes things very well. It was that
> document that I used recently to give me a clue to our utilization.
>
> The DSP calculator will tell you the DSP resources you need. (
> www.cisco.com/go/tools)
>
> As far as the routers are concerned, you should be looking at 2900/3900s
> at the minimum. 2800/3800 are end of life.
>
> Each model has it's advantages, but mainly it will be max calls, SRST
> capacity and expandability. Picking from one model to the next is hard
> because if the small incremental costs between them most of the time. Stick
> to what you need for the next two or three years and you should be fine. We
> really like to have redundant power supplies because of electrical
> maintenance that goes on and the fact that you can feed them from separate
> circuits/UPS units.
>
> There are docs on Cisco that will compare the router units.
>
>
>
> Sent from my iPhone
>
> On Nov 22, 2011, at 6:25 PM, gr11 <grccie at gmail.com> wrote:
>
> > Hi all,
> >
> > can you guys advise what approach normally you follow while calculating
> the below requirements:
> >
> > 1) Router size - 2801/2811/2821/3845 - any best practice
> > 2) ISDN Channel calculation - Ratio of Users to ISDN channels calculation
> > 3) DSP Resource calculation
> >
> > I have few sites (with size varying from 50 upto 1000 users) lined up
> for migration from PABX to VoIP. Was calculating the requirements, thought
> it would be good to have second opinion.
> >
> > CUCM is running on 8 and all gateways will be MGCP.
> >
> > If anyone can please share the best practices or their experiences.
> >
> > gr
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
>
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