[cisco-voip] Voice Gateway router size

[gr11]

Thanks guys!!

On Wed, Nov 23, 2011 at 2:18 PM, Erick Wellnitz <ewellnitzvoip at gmail.com>wrote:

>
> 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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