EX20 works with AT840/AT840P as extension module in which way the IP Phone could monitor extensions’ status.
Work with AT840/AT840P
20 programmable keys
Powered by IP phone directly
Double color LED indicator
Supports BLF, Speed Dail, DND, Directory, Redail, Call Transfer, Call Forward, Call History
Maximum 2 EX20 to work with AT840P at the same time