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Thanks for reaching out!
Hmm, because this is a third party app, I'm not quite sure what it is asking. Prefix can often refer either to area code, or the country code. Have you tried either of those options?
Based on the verbiage, it does sound like "IP Dial" would have something to do with Wi-Fi calling, but it's hard to tell with this phone. Keep in mind, it may not work exactly like Wi-Fi calling does on a T-Mobile branded phone. As for what IP prefix it's asking for, this is also hard to say because our phones don't ask for this. I'm thinking your best chance at getting more info on this would be to contact the manufacture directly. Sorry we don't have much more information.