Section 736.510  Interoffice Trunks

a)         WETC facilities shall be engineered so that at least 98% of calls shall not encounter an All Trunks Busy (ATB) condition and at least 98% of properly dialed calls, during the busy hour, shall receive ringing signal or station busy tone on the first attempt.  When the completion rate falls below 98% for three consecutive months, corrective action shall be initiated and such action reported to the Commission.

b)         For purposes of subsection (a), the information required to be reported shall be calculated by capturing total call attempts and calls that do not encounter an ATB condition that are going through trunk groups controlled by the reporting entity during the busy hour.  Calls that do not encounter an ATB condition should be divided by Total Trunk Attempts to derive the percent of calls completed without encountering an ATB.