Summons—Cross-Complaint (SUM-110) Tells a party who started a court case or another party that a person who was sued in the case is also suing them and what can happen if a response is not filed in 30 days. Get form SUM-110 Effective: July 1, 2009 View SUM-110 Summons—Cross-Complaint form Go to How-to instructions for Debt Collection