Accessing CPQ from Salesforce.com via Safari on Mobile device

We have a number of users who have gotten new iPhones. Previously via Safari they were able to log into Salesforce.com and open a quote and have Oracle CPQ open without issue. Salesforce indicates that the settings look how they expect but we need to understand from the oracle side what settings are required for the quote to open from Salesforce (stil in the browser). Does anyone else use Salesforce and Oracle CPQ on a mobile device and have any insight on what might need to be done for this to work?