Outgoing calls minute reminder I'd like to have this feature on outgoing calls:
- first vibrate (or beep) after 45 seconds call answered;
- then vibrate (or beep) after every other minute (1.45, 2.45, 3.45 ...)

I created this task in Tasker:
1. wait 45 seconds;
2. vibrate time 50;
3. wait 1 minute;
4. goto action 2;
and put in context: call outgoing.  

It kinda works but has a few shortcomings:
- timer starts just after phone number is dialed, not when call answered;
- task keeps going on after call is terminated, need to manually stop it.  

I tried with an exit task with an explicit stop action but did not work.
I read about AutoNotification plugin intercept feature but did not understand.
As Firelord confirmed this for stock Android, you might not need Tasker for that at all – your dialer probably supports this natively:

Open the Dialer, then check its settings. My dialer has there (in German, so don't take my translation literally):


vibrate when answered (additionally, also when hanging up or there's another incoming call)
vibrate every minute (15 seconds before it's up)


I'd say that's pretty close to what you're after – just keep the "vibrate when answered" off and tick the "vibrate every minute", and it's even a perfect match. No need for any additional app, if that's all :)