[cisco-voip] Complicated Design Issue

[Schuett, Court (MBNAP it)]

We've got a pretty complicated design issue I was hoping to get some help
with.  If anyone has any ideas, please let me know.
 
 
 
Some set up:
 
We have a main POP site in Chicago running a Call Manager Cluster and Unity
server.  We have a remote site in New York that is connected to us through
two T1s in our Sprintlink IP VPN (it's not MPLS, but close.  We do get QoS,
but not a full mesh).  We have a VPN Concentrator at our Chicago location
and all internet bound traffic routes through there.  There is no direct
internet connection in New York.  
 
The New York office has requested a VoIP upgrade.  There are approximately
60 users in New York, and 40 in the field.  By that, I mean that they have
40 people who permanently telecommute from their home.  These people are
scattered across the US and a few in Europe.  For these people, they want
7940s in their homes.  We plan on connecting these people with a VPN link
through an 871 in their home.  
 
We are planning on 2 PRIs for the New York office to handle their calls.
However, they would also like local numbers for their people.  I didn't
think this was possible, but maybe someone has a better idea.  They also
plan on having a 30 person conference once a week.  The remote users will be
the people on this conference.
 
The design question that is troubling me is where to place everything.  We
have an existing VPN concentrator in Chicago but we could possibly use a
router as a VPN concentrator in New York.  As I said, we have an existing
Call Manager cluster in Chicago that we are planning on using to handle
calls.  We are probably going to buy a Conference Connection server as well.
The question comes down to this:  where should we have the remote users VPN
in to?  Chicago, or New York?  Where should we place the Conference
Connection server?  We would like to place it in Chicago so that more people
can use it, but should it go in New York?  Is it possible to give local
numbers to remote users?  We are planning on placing a Unity server in New
York to handle voice mail for them, but if the WAN link is down, is there a
way for the New York users to receive and check voice mail?
 
All help would be greatly appreciated.  I was thrown this yesterday and (of
course) they need a solution in place by January 20.  
 
Thanks!
 
 
 
Court Schuett
 
Millward Brown
Network Systems Engineer
630-955-8983
court.schuett at us.millwardbrown.com
<mailto:court.schuett at us.millwardbrown.com> 
 

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