[cisco-voip] Voice Gateway router size

[gr11]

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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