I was recently watching one of @FirstThirtyMinutes' patrols, and after accepting a call, he decided to somehow cancel it, and promptly forced and accepted another one. I have not seen this feature in any readme or .ini files, so I'd just like to know how one can cancel a call.

If you accept a callout and press X i think you will cancel it.

41 minutes ago, Slendis said:

If you accept a callout and press X i think you will cancel it.

X forces a new callout, so it cancels the one you are currently on

19 hours ago, OfficerWalters said:

X forces a new callout, so it cancels the one you are currently on

As said above, X cancels the current callout as it produces a new one however there are multiple callout packs which have menus which often can have an 'End Callout' option or there is also sometimes a hot key to end the callout. Check your .ini and pay attention to any help boxes that may pop up when you start a callout.