I think I understand most of the concepts in play here, but I'm hoping 
someone can recommend some specific devices, designs, ideas, best 
practices etc.
We are planning on moving from a 2 PRI based Nortel Norstar to Sipx 
4.0.2. It is VOIP provided directly from Verizon over a Verizon DS3.

1) We have a handful of old analog devices (fax machines, copiers that 
phone home for billing, postage machines, etc). I would love to get rid 
of all these, but old habits die hard for some people.
2) I also have a separate PRI that goes it an Atlas Adtran 550 PRI 
router, that routes calls to a Rightfax fax server via internal PRI 
connection and a Perle systems modem bank over 4 internal ISDN 
connections. I would like to get rid of this PRI all together.

For the first part, I'm hoping to find the ideal device (ATA, Gateway, 
or whatever I need) to plug 5 to 10 of these analog devices in. I'm 
interested in one that can connect multiple devices that we would put in 
our data center, and one that would connect just a single device if we 
had to locate next to the analog device for some reason. Hopefully 
someone has had some positive experiences with some of these setups.

For #2, I think I have a few options. I believe I could put something in 
to route an internal PRI connection to the Atlas 550. I don't want to 
add any hardware cards to my Sipx machine, because I'm hoping to to put 
it on VMware one day if the issues there get worked out. I can make 
Rightfax Sip compatible for about a $3000 upgrade, and I could sell the 
current PRI card in it for about the same. That is what I'm leaning 
towards. Would it be simple to route a range of numbers from Sipx to my 
Rightfax server? I know I could have Verizon send them directly to the 
server, but they have proved to be difficult to work with, so I'm trying 
to keep as much control over this as possible.
As for the modem bank, it is only for outbound connections. I was 
ignorantly hoping there would be a simple SIP software modem client that 
would make this a breeze. I now understand why that isn't as simple as I 
was hoping. I only have a few hosts left that need to dial out. Is there 
something that would easily allow them to dial out through Sipx? Would I 
need to use a physical modem and hook up to the device described in part 
1? My current modem bank ( http://www.perle.com/products/833-RAS.shtml ) 
has 4 ISDN ports for outbound connection, so I could use that if it is 
an option to connect that somehow.

Thanks for all the help everyone here provides!

-Matthew
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