If you look at
You will see :-
The typical method for generating mid-call DTMF digit sequences is via a Smart Client on the user's remote destination phone. The Smart Client provides an easy and automated method for assigning these DTMF digit sequences to a set of softkeys on the remote destination phone. A Smart Phone user can then easily invoke the mid-call features by pressing the appropriate softkey.
Then a later, below you will find a "Note"
Currently no Smart Client applications provide programmed softkeys for automating mid-call features, therefore the only method available today for invoking mid-call features is manual key presses.
Followed by :-
While the Smart Phone method of using mid-call features is the preferred and easiest method to use, users without Smart Clients on their remote destination phones can still take advantage of mid-call features by manually keying the feature access codes and entering the appropriate key sequences.
So what are they trying to say ???
Is this a reference to CUMC or not ??
Was there a product that was a CUMC "lite" that just injected DTMF tones on SmartPhones, but was not released ??