Hey Justin,
Sorry my American's not real good, but bear with me. Well, it looks like you got the right connector. J2 is where the handset goes; if you follow the arrows, you can see that 'D - Audio Transmit' goes to the mic amp, so that is where the mic is usually connected (so mic goes between J2D and J2A). The mic amp output goes to J1U, which should probably be jumpered back into J1K 'Fixed Audio'; it will then go through the volume control, then the speaker amp, and finally to the speaker at J1E & F (speaker connects between J1E & J1F).
Don't use PTT as it will mute the speaker when you push it.
All the best.