If we encrypt the signaling between the phones and call manager but not the voice packets, can the call still be intercepted, reassembled and listened to?

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    Aug 11 '17 at 4:30

If the voice (also called the "bearer") traffic is unencrypted, it can be recovered and decoded. There are lots of tools to do that.

Signalling traffic flows between the Call Manager an phone (or gateway), while bearer traffic flows directly between phones (or phones and gateways). They are two separate communication streams.

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