[cisco-voip] Voice Gateway router size

[Erick Wellnitz]

http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/TA_ISD.html

On Tue, Nov 22, 2011 at 8:58 PM, gr11 <grccie at gmail.com> wrote:

> 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
>> > _______________________________________________
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>> > https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>
>
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