You can ask for them to provide "extra detail" over email outside of the call as you think that question may need some detailed thought/extra checks etc.
I'm a huge fan of sending follow up emails for all phone calls regardless of who is on the other line- I have a bit of hearing loss and all phone calls are a bit garbled for me, doubly so if there's a lot of background noise on my end.
I will typically follow up a phone call with something like "Hi Percival, just to follow up on our phone call today, we landed on Widget A going into V1.2.34 instead of 1.2.32, having the Howitzer firm handle the BigDoodle transition to Python instead of doing it ourselves, and you said that you'd follow up with the FlimFlams and I'll follow up with the Wannabes and the Charlitans. Let me know if I missed anything."
Doing this has saved my butt more times than I can count.
Additionally folks reading your takeaways this way will often think of things they didn't while babbling on the phone. Time to cogitate can shake loose important things.
Exactly. At that point about 50% of the time I'll get a reply along the lines of "Oh yeah Wakeen said he'll contact the Charlatans, don't worry about that" and then I have less work to do.
I will typically follow up a phone call with something like "Hi Percival, just to follow up on our phone call today, we landed on Widget A going into V1.2.34 instead of 1.2.32, having the Howitzer firm handle the BigDoodle transition to Python instead of doing it ourselves, and you said that you'd follow up with the FlimFlams and I'll follow up with the Wannabes and the Charlitans. Let me know if I missed anything."
Doing this has saved my butt more times than I can count.