Single Line TelephonesDSX Component Guide Components ◆ 3ComponentsSingle Line TelephonesDTH-1-1 Single Line TelephoneThe DTH-1-1 is a cost-effective analog single line telephone that offers 5 fixed feature keys, 4 Speed Dialbin keys and Message Waiting. The built-in Message Waiting lamp will flash for incoming calls or when theuser has a message. To simplify working in groups, The DTH-1-1 provides 3 selectable ring tones.DTR-1-1 Single Line TelephoneThe DTR-1-1 is a stylish yet rugged analog single line telephone with 5 fixed feature keys and MessageWaiting. Similar to the DTH-1-1, the DTR-1-1 has a built in Message Waiting lamp that will flash for incom-ing calls or when the user has a message. The DTR-1-1 offers programmable ring pitch and volume. Built-inwall mounting and a bridged data jack for connecting a modem or answering machine are standard.DTR-1HM-1 Single Line TelephoneThe DTR-1HM-1 provides all the features of the DTR-1-1 in addition to two additional fixed function keys(for Hold and Speaker/Monitor) and 8 Speed Dial bin keys. For convenient on-hook dialing and call monitor,the DTR-1HM-1 also offers Handsfree Monitor.At a GlanceP/N 780034 (Black)Fixed Function Keys: 5 Message Waiting: YesSpeed Dial Bin Keys: 4 Ring/Message Waiting Lamp: YesSelectable Ring Tones: Yes Wall Mount: Built-inAt a Glance P/Ns 780020 (Black) and 780021 (White)Fixed Function Keys: 5 Message Waiting: YesSpeed Dial Bin Keys: None Ring/Message Waiting Lamp: NoSelectable Ring Tones: Yes Wall Mount: Built-inHandsfree Monitor: NoAt a Glance P/Ns 780025 (Black) and 780026 (White)Fixed Function Keys: 7 Message Waiting: YesSpeed Dial Bin Keys: 8 Ring/Message Waiting Lamp: YesSelectable Ring Tones: Yes Wall Mount: Built-inHandsfree Monitor: Yes