Again though, I don’t think the way you’ve framed this is accurate.
“Was finally forced to take his call” implies that Trump has been trying to speak to Carney and Carney has actively been refusing to take his calls up until now.
Nothing that has been said from either the Canadian or American sides backs that up. Every indication is that when Trump’s team reached out this week to schedule a call, that was the first time since Trudeau was still our PM that either side has made any attempt to engage in direct PM-to-President level talks.
Also worth keeping in mind that the ball has been in Trump’s court all along here. The very longstanding standard convention in international diplomacy is that when a new head of government takes power, the onus is on other countries to reach out to them. Carney being the one to reach out instead, especially in light of the threats to our sovereignty, would have been a weak-ass, submissive move.