Short, focused, cross-team.
The Scrum of Scrums, first used by Jeff Sutherland and Ken Schwaber in 1996, gets representatives from each team together to clear cross-team blockers.
Who
One Per Team
Whoever is best placed for this week's issues.
Often a developer, not a manager.
What
The Seams
Dependencies, integration problems, shared blockers.
Not each team's status.
How often
Little And Often
Daily or a few times a week, fifteen minutes.
More often when integration is tight.
Source: ScrumPLoP Published Patterns: Scrum of Scrums ↗
Cross-team blockers. Short, focused, frequent.