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IP telephony cluster over internet

HNETENG
Level 1
Level 1

If I have a local site with LAN Network that has CUCM Publisher, CUCM subscriber and some IP phones. This LAN network is connected to the internet through firewall and router. And there is a remote site over the internet which has another CUCM Subscriber.

 

Can I have a high available IP telephony scenario by registering the IP phones on the local CUCM subscriber on the same LAN and in case the local CUCM subscriber goes off, then the IP phones can join the remote CUCM subscriber over the internet which is part of the single CUCM cluster over built over internet.

 

Note: the RTT of the internet circuit is around 50ms and its speed is 50 mbps.

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