Sounds like you did ok. No extra work in the setup.
But consider calling out from your apps. Do you have to go through the AA, or can you dial direct to any number?
Is it possible to use TalkaTone or other iOS apps instead of ObiTalk?
How would I get those apps to login to obi given my OBi number is 12345678?
There are no alternatives, Talkatone doesn't sign into the Obi. It signs into gmail just like the Obi does. for that reason only one can be signed in at a time. Generally the Obi gets kicked out for the app.