asterisk users - Oct 2004 - Seeking a VoIP Solution for a big company

HI Everybody!

My company is seeking to replace its legacy PBX by a VoIP solution; since we 
prioritize the Open Source Paltform we have found Asterisk doing our own 
research and we are very interested in it.
Knowing that we are decided to make the move to VoIP, can somebody tells me 
the feasibility of deploying such a solution in an environment that has the 
following technical requirements:

- 250 Users for the Headquarter (100 Mb LAN)
- Around 50 remote sites ( WAN Technology: Leased 
lines/ISDN/VPNADSL/Wireless)
- Unified messaging
- Small call center (10 users)
- CTI Applications
- Interoperability with the existing carriers ( Phone companies/ 64 lines)
- Security


Thanks for your reply

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> Knowing that we are decided to make the move to VoIP, can somebody tells me
> the feasibility of deploying such a solution in an environment that has the
> following technical requirements:
> - 250 Users for the Headquarter (100 Mb LAN)
> - Around 50 remote sites ( WAN Technology: Leased
> lines/ISDN/VPNADSL/Wireless)
> - Unified messaging
> - Small call center (10 users)
> - CTI Applications
> - Interoperability with the existing carriers ( Phone companies/ 64 lines)
> - Security
Asterisk can handle all of this. Not all of it is canned (i.e. CTI
applications) but all very possible with a little effort. You might
want to look in the wiki for for consultants in your aread
http://www.voip-info.org/tiki-index.php?page=Asterisk%20consultants
as this would give you a head start. That is a pretty big
implementation to take on without any experience.

Hope this helps,

-Chuji