[cisco-voip] Connecting multiple clusters together

[Ryan Ratliff]

Looks like you've got the basics down.  If the connection between offices is
data then just create an ICT pointing to the servers in the other cluster
(and do the same on their side) and use a route pattern to route calls via
the ICT.   Make sure the IP routing works to their servers and from their
voice vlan to yours and you'll be good to go.  For QOS between them ICT
calls are just like H.323.
 

-Ryan 

 

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Micah Bennett
Sent: Wednesday, November 19, 2008 10:06 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Connecting multiple clusters together



Are there any documents or can anyone comment on what is needed and how you
go about connecting multiple call manager clusters together. 

In the next few weeks and months I expect to be connecting to our new parent
company.  I believe they are on CCM 3.x.  We are on CCM 4.2(3).

They are using IPCC 3.x and we are using IPCC 4.x.  I know that they have
two offices using CCM.  I don't know if its one cluster or two clusters.  I
believe it is just one.  I don't know of any plans or need to integrate the
IPCC portions at this time, but I do believe we want to establish office to
office extension dialing as soon as possible.  

Here are some of the things I think I know.  

1.      We are going to need some type of connection to them.  I assume this
would be a T1 at minimum.  If it is one cluster, we should only need one to
the main location.  If there are two clusters we will need a connection to
both.  Our network is using Sprints MPLS cloud.  We should be able to drop
connections from those two new offices directly into the MPLS cloud that we
are already connected to. 

 

2.      Traffic between the locations will use G729 to get the best use out
of the smallest connection.  We do this between our existing two locations.

3.      If they are using extension ranges that conflict with our existing
ranges, each office will need to do some type of translation to avoid
someone having to change extension ranges.  For example if they have an ext
2352 and we have an ext 2352, we will need to assign a leading digit to each
office.  I might dial 6(2352) to get to them and they would dial (7)2352 to
get to me.

4.      Instead of routing calls to those offices extensions out to the
PSTN, I would route them across the connection to the other offices and they
would have routing set up to accept the digits I sent, and convert them back
to the proper extension for routing the call to the correct location.

Am I on track so far, or is this totally wrong?

Thanks in advance.

Micah Bennett

Telecommunications Admin

Automated License Systems

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