The IPE2500A-MLS Multi-Line Select Deskset provides "Mini-Console" tone control of up to 4 different radio systems in addition to having all the features of the standard IPE2500A Tone Remote Deskset. Used in conjunction with the GAI-Tronics tone remote adapter (ITA2000A), the Multi-Line Select Deskset allows for simultaneous transmissions on any combination of 2 to 4 lines.