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2851 and encryption VOIP communications

Hi,

I have a router 2851 with this verione of IOS c2800nm-spservicesk9-mz.124-20.T.bin. This version VOIP doesn't support the encryption of the communications? With this version I am not able in any way to protect the conversations, do I necessarily have to purchase an upgrade of IOS? Thanks for the help. Hi to everybody

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