ETL has used an International Telephone Switching System or International Service Center (ISC) with signaling number 7 in order to integrating internationally and there is only ETL has the full right to service in this area in the Lao P.D.R which it was donated by the government and the people of Japan in 2004. International communications all over the world have been used the best quality and the latest technological equipment through Optical Fiber System and Satellite Standard A in order to assuring information safety by using high quality monitoring system. Moreover, ETL has skilled technicians in various levels who have high experiences in managing and maintenance International Telephone Switching System which it has become the most valuable international telecom equipment in developing telecom system in the Lao P.D.R.