Just had a quick look through that doc - my it’s dull. Not a lot of references other than CPDLC still needs a SELCAL check. Experience over the last 11 years is that if we don’t include CPDLC in the initial call the response is likely to be “ABC XXX confirm you’re CPDLC, Shanwick next?” “Affirm”. “Roger, here’s your SELCAL”.
So I just do!
rgds