An ERP (Enterprise Resource Planning) system is an information technology (IT) solution that allows, manages business processes, improves the efficiency of management decisions and innovative business operations of telecommunication companies. The major goal of this research is to identify crucial success factors and assess their impact on ERP implementation in the telecommunications industry, specifically at ABC Telco Company. The information was gathered using a semi-structured interview and a Pareto Analysis questionnaire survey. Based on the results, The one CSFs from the interview result is included as the 'vital few' CSFs that occupy a significant portion (80%) of the total percentage of occurrences based on survey result which is Effectiveness of Project Leader that mean this CSFs must be attentive and focused by ERP practitioners in the Telecommunication industry along with the others most influence and 'vital few' CSFs and they must ensure the remaining CSFs should not be ignored. Furthermore, it is recommended to assign the capable project leader to make a strategy for implementation of the ERP and determine what approach the team should take to achieve that success of implementation. Once these goals are put in place and enhanced, the other CSFs should be consolidated.