Possible Solutions:
The 10-Minute Rule
Limit meetings to 10 minutes or less. If it's more than 10 minutes, it's not a meeting, it's a conference.
Learn more about the 10-Minute RuleThe No-Email Solution
Just send a mass email with a simple "I'm on a call" response. No need for attachments or detailed reports.
Read about the No-Email SolutionThe Meeting-Free Zone
Designate a specific time or place as a "meeting-free zone" and stick to it.
Learn more about the Meeting-Free Zone