We've seen incoming activations of a stargate and before the wormhole forms, the wheel on the gate starts spinning, which helps provide a warning an incoming wormhole is about to form. Since the wormhole isn't formed yet (there's no event horizon at this point), that means the originating gate is in contact with the destination gate, even before a wormhole is created.
If one stargate is attempting to create a wormhole between itself and another gate, once it has the coordinates, it will need to connect to the gate to to open a wormhole to it.
Stargates have created wormholes over extremely vast distances light years apart. How do they communicate with each other over those distances before they open a wormhole?
Answer
There's a fair bit of evidence that there is a subspace communication of some kind in the SG universe. Furthermore, it is a known fact, from SG:U, that there is some kind of a very strong shock in subspace, sent when gates dial. Specifically, it's how the Control Ships find Destiny. Therefore, I'm going to hypothesize that the gates somehow communicate with each other via a subspace connection of some kind before they make the connection.
More proof of this is that in the episode Common Descent, Eli takes a subspace transmitter from a stargate and uses it to communicate with Destiny.
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