Stargate/Star Trek - would Stargate Earth be eligible for First Contact?

This is just something I thought of the other day.

If Stargate ever introduced an interplanetary federation similar to Star Treks Federation, that had the same rules and protocols for first contact, would present day Earth be eligible for First Contact since groups of Humans have established themselves in the Galaxy, and beyond, and have FTL travel, or would this Federation not deal with them since Earth isn't fully united and not everyone knows about what is happening?