Hello -
You'll need a fairly simple setup - either a codec box like the CDQ Prima or software like AudioTX Communicator (this is the cheaper and newer solution).
Both of these will allow you to connect to almost all voice-overs and production studios worldwide. Basically an ISDN codec link gives you a live, bi-directional, high quality audio connection, so that you get the voice-over's contribution coming to you one way and the feed from you to them is normally talkback or direction of the voice.
With both systems you can expect broadcast quality audio and what should be the perfect solution for your application.
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Mo