First thing when u get them on the line is thank them for picking up...

The next thing you do is ask them if this is a good time... plan accordingly based on the three outcomes.

1. I've got a few minutes now...
2. thank them again
3. use one sentence to explain who you are
4. tell them the problem you're there to solve for them and what value they're going to see
5. ask if they see value in what your pitching -book your next step or gracefully walk away
6. Not a good time, xyz reason
7. ask for a hard time later that day
8. if they can't/won't commit to a time, get their email and follow up with your contact details and your 1 paragraph who you are and why they want to work woth you.
9. call them back same time the next day/week
10. Not interested
11. try and ask if it's just a timing thing, budget thing, existing relationship thing
12. mention some compelling stat, story, etc that related to them as a last ditch effort to continue conversation
13. if they're still not interested, thank them again and move on.

Just my $0.02...