SHONCO 2 Pack 10M 33ft Phone Telephone Extension Cord Cable Line Wire with Standard RJ11 6P4C Plugs for Landline Telephone,Black You can use from wall phone line to a telephone. Male RJ11 to male RJ11 Telephone Cables are used for standard RJ11 phones.For use with telephones, fax machines, modems, answering machines, etc.Not work as a Ethernet Cable (Example: internet box to xbox). It is good to long-distance communication for your desk phone or office phone .Extended length coiled cord is provided Extra Length for working in the office or at home. Phone line length of 33 ft, 6p4c connector. Not applies to VOIP phone and Cat 5 is Category 5 UTP cable, typically used for Ethernet with a 8P8C (RJ45) plug. This is standard telephone cord with RJ-11 for use with landline telephones, fax machines, dial-up modems, etc. Universally compatible Telephone Handset Extension Cord Cable with all telephones manufacturers including AT&T, Cisco, NEC, Rolm, ITT, & Tie.You can use them as replacements for those and Avaya 5420 and 5610SW IP phones. Color: white; Safety: Flame Retardant PVC Jacket