As far as I know, there is no standard procedure in recruiting. All there is are guidelines as to what types of contacts are appropriate and allowed, vs. what is not, and time frames/periods during the calendar years specified as to when you can have those types of contact.
Establishing standard procedures is something Edsall actually fought for pretty adamantly with the powers that be.
But - to my knowledge, how you get from initial contact with a recruit, to a signed NLI is entirely up to the people and institution doing the recruiting, and nothing is binding aside from that signed NLI by all parties.
A commitable, vs. a non-commitable offer? That's pretty funny stuff though.