The CRTC issued a call for comments Monday on its two-month-old decision to force telecoms to implement measures to reduce caller ID spoofing and offer services to manage nuisance calls. In November, the regulator ordered telecommunication service providers to implement new measures, following a public consultation that began a year earlier. The new rules require that “spoofed,” or hidden, phone numbers be blocked at the network level and subscribers be given the ability to opt into services that would manage those nuisance calls. The CRTC is now asking for information and comments on the “implementation, use and effectiveness” of measures to authenticate caller ID information for wireline, wireless and voice-over-Internet Protocol (IP) networks, tools to trace and identify the source of a call, barriers to implementation of these tools and what regulatory measures, if any, should be put in place. The deadline for interventions is Feb. 8. The CRTC and its United States counterpart Federal Communications Commission (FCC) signed a partnership in November to help combat unwanted calls.