Change "Default" ringtone to match my regular iphone ringtone?

I have an iphone that I use exclusively for work. I like a loud ringtone (similar to old fashioned phones), because I work from home, and I need to be alerted if I'm in a different room from the phone. Before I transitioned from the Office@Hand iphone app to the RingCentral app, all calls came through with the ringtone I chose in my settings. Now, with the RingCentral app, I get a completely different ringtone, with no choice for something that's not a soothing sound. The default Xylophone is terrible. Is there a way to change what my "Default" is, so I can make it the same as the old phone sound I've got for all the other calls coming through? Customers tend to call my direct number as well as the RingCentral number, so I need some consistency in the ringtones.