LaylaLala;
We were actually called for an interview before the AIP. Since we had a red flag to our file I (sponosor) was questioned for about 50 mins and my husband was asked to wait with our son outside. Than once the officer was done with me she called in my husband for less than 2 mins and then asked both of us to come in and she gave us AIP. They only call you for an interview if there is something serious in your file. I guess someone doesn't like us thats why created problems for us thats why our process took 22 months. Your file was cleared thats why they sent you AIP without questions so your good
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All the very best for the last step which is the PR that my husband is waiting for too.