Hi Rodrigo,
I asked around and unfortunately phone redundancy does not appear to help with AWS outages. Here are a couple of articles that might be of interest to you.
Phone redundancy:
https://help.mypurecloud.com/articles/phone-redundancy/
Remote survivability with the PureCloud Edge:
https://help.mypurecloud.com/articles/outage-and-failure-survivability-for-the-purecloud-edge/