Norstar T-Series Handset Push to Mute
Norstar Telephone Handset Push to Mute for Nortel T7000 series: T7100, T7208, T7316. Also, Meridian handset for M3900 series: M3901, M3902, M3903, M3904 and M3905 phones. This handset has a button so you can mute yourself or background noises at your convenience. This is just the receiver, not the entire telephone.