Police dispatchers make up the first line of communication for police and emergency services.  Education-Portal offers useful training for dispatchers.

http://education-portal.com/police_dispatcher_training.html

Federal Law Enforcement Training Center has a number of communication based training sessions. 

http://www.fletc.gov/training

If you are a new Communications Training Officer (CTO), this course will teach you the basic processes to apply when training new dispatchers.

http://www.iptm.org/

A groundbreaking call-handling system by PowerPhone that combines flexible guidance, innovative tools and powerful techniques with one proven call-taking formula to empower public safety call-takers to make thoughtful, outcome-driven decisions in any situation.

http://www.powerphone.com