Cortelco Colleague corded two-line telephone 90V Message waiting lamp Handset volume control Hook delay (positive line disconnect) A-lead control Data jack Hearing aid compatible Hold with LED indicator (flip-flop type) Last number redial Flash (100-300-600mS) switchable 10 One-touch programming memory Mute with LED indicator (flip-flop type) Speakerphone with LED indicator Headset control switch Line in-use status with LED indicator Conference button Frost ITT2205FROST
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