Jct22's post is spot on if you are on newer CM and You are talking about an h.323 phone. We have a 5.2 CM and the change needs to be made ip-network-map. You will probably need break out the address range unless you want to move all the phones in that subnet. If it is a SIP phone it needs to be done under Location in System Manager.
It would ideally be done through the "ip-network-map" if this wasn't a one off scenario. If this is being done at a station level be sure you understand the consequences (routing wise).
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