[cisco-voip] CCM Intercluster trunk with breakout to private phone VPN

[Damian Turburville]

Hi all,

First let me lay out the situation, we have a mixture of offices with a mixture of phone systems including meridian, siemens DX, siemens Hi-Path and Cisco Call Manager. They are all part of a local Featurenet system where they can make (5-digit) extension to extension calls to each over what amounts to a private phone VPN (mainly DPNSS over E1)
We have a trusted third party whom we have a firewalled off 2mb data link to who has a call manager 4.x.
The idea is for us to be able to make calls and receive calls to this call manager 4.x
Would it be possible to setup an Intercluster trunk between their call manager and one of ours (we have a 4.1 and a 6.1) and have them break out onto our private phone VPN from our call manager?
To hopefully make it more clear

Site A - trusted third party with call manager 4.x (extension range 68xx)
Site B - internal site with call manager (extension range 66xxx)
Site C - other internal site with another phone system (extension range 20xxx)

So if we setup an Intercluster trunk between Site A and Site B would Site A be able to call Site C and vice versa?
Also would anyone know what ports we would need to open on our firewall (we would have to NAT the connection) to allow this to work.
Thanks,
Damian


      
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