Unanswered Question
Sep 15th, 2008
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I need a solution for IPT over internet. I have a head office in India and two branch offices overseas, we are connected each other through Internet. Now can you let me know “I can use one call manager for these three networks? What is the feasible solution?



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gogasca Tue, 09/16/2008 - 00:49
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I assume u use VPN and CUCM as long as there is network connectivity between IP Phones and CUCM should work. More details in our SRND guide

Marwan ALshawi Tue, 09/16/2008 - 01:12
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just to add to the helpful comment from GONZALO

that u need to consider the fact that u need to includ TFTP,SCCP, and other call signaling protocols that u might use

and also u need to have sort of SPF (stateful packet filltering) to let u pass the negociated udp trnsperantly and securly over vpn or any typ of conectivity

have a look at the following link which involive cisco firewall for voip over VPN:


this link advanced concept but good:

Cisco Unified Communications Voice over Spoke-to-Spoke DMVPN Test Results and Recommendations


god luck

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