RJ-11 6P4C Round-Solid 3 Prong 100/Jar
https://dev.nsiindustries.com/product/rj-11-6p4c-round-solid-3-prong-100-jar-2/
Traditional style modular plugs for use in terminating cables in both telephone and data applications. Manufactured to comply with FCC 68 guidelines and are UL listed., 849160001096