When you plug in the ip phone at the remote site, you have to assign it a temporary ip address on that local network and if it does not discover the default gateway of the remote router, you have to enter that in also. Program all of the other setting on the ip phone as if you were installing it on the main site. Then, when the ip phone finishes initializing it will assgn itself the virtual 172.x.x.x ip address.
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