Phone numbers stored in Notes are recognized as such.
To store the number of a conference call, including log-in code you can either add:
between phone number and code. This results in a short delay before code is entered
between phone number and code. This results in a pause until you press to continue
To be sure code isn't entered too early we recommend to use the pause option
As soon as you hear a question to enter your code press Dial "123" at the bottom