Question about Olympia OL2400 Cordless Phone

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Phone has busy signal, on my olympia OL 2400 phones.

Recently my power went out in the neighborhood and when it came back on my phone did not work it only had a busy signal when I pressed talk and I could not answer a incoming call. The other three extension handsets also act the same,but all my other non OLYMPIA phones work fine. Does anyone know what blew? Thanks Sal G.

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