[cisco-voip] Connecting multiple clusters together

[Lelio Fulgenzi]

You can connect clusters together via PSTN gateway, e.g. T1s or via IP, e.g. intercluster trunk. 

I would investigate an intercluster trunk. Very easy to setup and you add it to a route group. If you have more than two clusters, you can still use an intercluster trunk, but then you have 6 trunks instead of two, basically fully meshed. Still manageable, but more than 3 you should consider a gatekeeper. 

This page should help you out: 

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080094729.shtml 


--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
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"Bad grammar makes me [sic]" - Tshirt 


----- Original Message ----- 
From: "Micah Bennett" <mbennett at als-xtn.com> 
To: cisco-voip at puck.nether.net 
Sent: Wednesday, November 19, 2008 10:05:58 AM GMT -05:00 US/Canada Eastern 
Subject: [cisco-voip] Connecting multiple clusters together 

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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