You can use up to 12 designated Trunk Hundreds Select buttons on each console. You can also administer up to 12 of the feature buttons as additional Trunk Hundreds Select buttons, for a total of 24 Trunk Hundreds Select buttons per console. You can use each button to directly access an outgoing select trunk group.

While an attendant talks on a call, the attendant can be split away that call and place a new call to the outgoing trunk that is specified by the trunk group select button. The attendant can then press Release to connect the split-away parties to the dial tone on the trunk. Or the attendant can dial the destination, and press Release to connect the split-away party to the called party.

All Trunk Hundreds Select buttons, including any that are administered on the feature buttons, have a Busy lamp. This lamp lights when all trunks in the associated trunk group are busy. If you administer one of the two-lamp feature buttons on a basic console as a Trunk Hundreds Select button, use the bottom lamp as the Busy lamp. Six of the designated buttons on a basic console, or all 12 designated buttons on an enhanced console also have a Warning lamp and a Control lamp. The Warning lamp lights when a preset number of trunks in the associated trunk group are busy. The Control lamp lights when the attendant activates Attendant Control of Trunk Group Access for the associated trunk group.

You can assign Loudspeaker Paging zones instead of trunk groups to Trunk Hundreds Select buttons. The Busy lamp then indicates the idle or the busy status of the associated Loudspeaker Paging zone.