The CRTC announced in a decision Monday that it will not permit Bell Canada to use its “call blocking” system for the routing of long distance traffic. The commission said local phone companies designated as competitive are required to route all long distance calls to the customers of small incumbent carriers through toll interconnection trunks and not through Bell. The CRTC said Bell Canada's “call blocking” enforcement systems are not capable of screening calls based on the geographic location from which they were placed. The commission expressed concern that come customers using voice-over-IP (VoIP) or wireless services could have their calls improperly blocked. Bell’s proposal sought to have long distance calls to small incumbent local carriers routed through its local transit interconnection service. The CRTC published an application from Telus Communications Corp. Monday that also said VoIP and wireless calls that are legitimate could be improperly blocked as a result of being wrongly identified as long distance calls.