e POI. capacity enhancement Benchmark value is 60 d from the date of acceptance (maximum); however, the time can be shortened in the case of need. Interconnection route This parameter refers to the traffic dimensioning of the POT utilization parameter route. Considering the queuing theory analysis [6], the prescribed benchmark for the route utilization parameter is 70% [7]. Mean time to repair for When there is an alternate router for traffic that traverses the POI, POI ports then the port failure time duration should not be greater than 72h [7]; however, when the traffic is completely interrupted due to the failure then the restoration much target much shorter intervals (e.g. up to 1 h; however, the best value is zero time to repair). Time to repair The interconnection route should be repaired in time shorter than interconnection route Dual seizure ratio This refers to simultaneous seizure of the same channel (circuit) from both ends on the different sides of the POI. The best value for this parameter is zero. Signaling link utilization This KPI value should not exceed 40% of handling capacity in case of a failure. To avoid signaling congestion there are required sufficient number of signaling links provided between POIs. Unit of time measurement The measurement time unit for billing purposes in CDRs should and recordings in CDRs be in either seconds or milliseconds, to avoid any billing disputes (Call Data Records) between telecom operators. Clock synchronization and The TDM interconnection is based on SDH, where SDH requires accuracy of switch time strict synchronization which is independently done in each of the interconnecting networks. Therefore is recommended synchronization with provision of reference to the clock of the interconnection provider (or other network provider). Acceptance testing and For establishing a new POI there is required uniform testing monitoring procedure (it should be reviewed after given time or upon a need), with a regular monitoring mechanism. It is recommended do be done by a go