Minn. R. 7810.5300
DIAL SERVICE REQUIREMENTS
Sufficient central office capacity and equipment shall be provided to meet the following minimum requirements during average busy season, busy hour: A. Dial tone within three seconds on at least 98 percent of telephone calls. Dial tone delays of more than 2.6 percent of calls on a continuing basis indicates a need for investigative or corrective action. B. Complete dialing of called numbers on at least 97 percent of telephone calls without encountering an all-trunks busy condition within the central office.