Just to answer a few questions first. I am using google voice for my voicemail, but I am using my phone number and not a google number. My phone would ring once on my end and then go straight to voicemail. I've been told by multiple people that the phone would ring either once on their ends, or would go straight to voicemail.
I just got off of the phone with AT&T support. Apparently there is no way to change the amount of rings on our end. This has to be done by AT&T. Support was very helpful and changed my settings to where the phone rings for approx 15 seconds, which equals 5-6 rings with my ring tone.
Posted this just in case anyone else runs into this problem.