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UC540 UC320 how to interconnnect two offices??

Ok so i have to offices that i want to interconnect with the Uc320w and UC540, the main one has the UC540, i want to make extension calls between the two, in the two i have an equipment that provide dhcp to data lan and the UC's provide the dhcp to voice lan.

I to have an spa8800 that is registered to the UC320 but i dont know much about this equipment(spa8800).

The two offices are to be connected with a vpn for other services but i supossedly can pass the voice lan between the two.

The topology is very similar in the offices.

WAN Router-----------Switches------------UC540

WAN Router-----------Switches------------UC320----------SPA8800

I already have the two UC's working appart .

How can i interconnect these two to make extension to extension calls without dialing long distance.

Sorry for the newbie question.


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