The ESI 24 key DFP telephone is designed for users that do not need all the features

of the 48 key HDFP telephones.

It comes with 12 programmable buttons and a dedicated voicemail key and is a speakerphone..

The 24 key DFP will work on the S class gen 1 and 2, the E class gen 1and 2,

50L and CS 50 and CS 100 and 200 telephones systems.