Oklahoma Local Form 7004-2(B) Certificate of Service for summons is a form used by legal representatives to prove that a summons has been served to a particular party. This form is used in Oklahoma when a process server serves a summons to someone who is not a resident of Oklahoma. The form contains information about the plaintiff, defendant, process server, and date and method of service. There are two types of Oklahoma Local Form 7004-2(B) Certificate of Service for summons: (1) Service by Certified Mail, and (2) Service by Sheriff. The Service by Certified Mail form should be used when a process server serves a summons via certified mail. The Service by Sheriff form should be used when a process server serves a summons via a sheriff or other law enforcement officer.