Voice & Data over building to building wireless link

We have two buildings that are currently connected via a frac-T1. Most of the traffic is data but 2 channels are voice. We want to eliminate the T1 and replace it with a wireless solution. A site survey has been done and we should be ok. The distance between the two buildings is around 4 miles.
Besides the two antennas and bridges, what equipment would we need and how do we accomplish this feat?
Thank you.

For a straight Aironet install, don't forget the stuff you need to put in a fiber link from the Aironet to the rest of the network (transceivers, converters ... it'll depend on what equipment you already have). A span of fiber will help prevent environmental hazards (catching a power line, lightning) from getting to the rest of the network.
If you want to continue passing the voice, you can probably add a couple 26XX routers at each location with FXS/FXO ports.
You may want to look at some other options for the point-to-point. There are a number of microwave systems (using non-licensed spectrum) that can give you T1 speeds or higher. The interface is generally a V.35 connection and the bandwidth can be carved up like a traditional T1 (X cannels Data, X channels voice).
Good Luck
Scott

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