The CRTC announced Thursday a three-month trial that allows 911 call centres to respond to text messages. The 911 text messages would come from pre-registered participants with hearing or speech impairments. Participants for the trial will be in Vancouver, Toronto, Peel Region and Montreal, the CRTC said. "This trial will give us the technical and operational information we need before making a final decision on whether to expand the program nationwide," Leonard Katz, the CRTC's acting chairman and vice-chair of telecommunications, said in a statement. The trial was developed by the CRTC, a group of public safety officials, telecommunications companies and the hearing and speech impaired community, the commission said.