GATINEAU, Que. — The CRTC should take a leading role — at least temporarily — in co-ordinating the development of next-generation 911 services, the regulator heard Monday as it kicked off a week-long hearing into the future of the emergency call system. Making the transition to an environment where 911 call-takers, or public safety answering points (PSAPs), can receive communication other than voice (such as text, picture and video messages) needs outside guidance,...