Following on from my earlier post about VoIP solutions, has anyone out there implimented Unified Messaging On Exchange 2007? It seems to tick all the right boxes but it is a new technology and from the research I have done so far seems to be getting a fairly mixed response.

I have used Exchange for voice mail services in the past via third parties and it worked well so I am keen to hear your thoughts (good and bad) on this technology

Also, if anyone can recommend a good make/model for a VoIP PBX I would be greatful. Needs to support 15 - 20 users initially but scale to at least 500 over time

Many thanks

Paul
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I've seen it working well on OpenXchange, which is an area an associate specialises in (VoIP apps with OX).

For 15-20 users, why not just use OX on whatever hardware you usually use? You'll probably find it will scale beyond 500 users, but all my pal's clients are small and micro businesses, so I can't comment from personal knowledge.
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I've seen it working well on OpenXchange, which is an area an associate specialises in (VoIP apps with OX).

For 15-20 users, why not just use OX on whatever hardware you usually use? You'll probably find it will scale beyond 500 users, but all my pal's clients are small and micro businesses, so I can't comment from personal knowledge.
Thanks mke,

Unfortunately the client is a strict microsoft/cisco shop hence why I am looking at Exchange.

Cheers

Paul
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You'll have no problem whatever with Cisco kit. Recommended by all with strongly tailored deep pockets being the only caveat. Lasts forever, so not expensive longer term.

Who's to know what platform your solution is on, Paul? OX is made to work with M$ connections and networks. I haven't used its VoIP facilities but I know the rest of it well and it works superbly. Clients love it.
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Have a look at www.trixbox.org. It is Linux based but you don't need Linux expertise to manage it as all of the management is web based. It is based on the Open Source Asterisk (www.asterisk.org) IPPBX technology.
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trixbox is very good. But if you're looking for the wider functionality of email and calendering collaboration, which is why I'd assumed you mentioned Exchange, it would have to be OX or some such wider spec'd app.

leemason, all viable VoIP apps today, both open soure and proprietary, are based upon Asterisk. The other protocols are add-ons and can't work entirely without it.
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leemason, all viable VoIP apps today, both open soure and proprietary, are based upon Asterisk. The other protocols are add-ons and can't work entirely without it.
I'm not sure what you mean about all viable VoIP apps being based on Asterisk. Yes there are quite a few Asterisk based IPPBX system but many that are not (i.e. SWYX, Avaya IP Office, Ericsson MX-ONE, pbxnsip, etc). Asterisk is not a protocol, but it does use SIP, IAX2, and H.323 protocols itself. These are all of the major VoIP protocols used today (except for CISCO of course and there SCCP protocol and MGCP).
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