The ITT-Cortelco Colleague telephone series is a feature-rich series of analog office phones with a larger array of options than those on the 2500, 2554, and Centurion series.

Some Colleague models have caller ID. A number have speakerphones. And several different voicemail message waiting standards are supported (depending on model)

ITT ITT-2200 PRICE:$70.87 Colleague Enhanced Disposition Plus multi-feature speakerphone...more info... Buy one	ITT ITT-2201 PRICE:$30.34 ITT Colleague feature phone...more info... Buy one	ITT ITT-2202 PRICE:$40.43 ITT Colleague memory plus...more info... Buy one
ITT ITT-2203 PRICE:$43.54 1-line Colleague speakerphone...more info... Buy one	ITT ITT-2204 PRICE:$63.16 Cortelco Colleague enhanced speakerphone...more info... Buy one	ITT ITT-2205 PRICE:$65.41 2-line Colleague telephone...more info... Buy one
ITT ITT-2210 PRICE:$69.34 Colleague enhanced multi-feature caller ID speakerphone...more info... Buy one	ITT ITT-2211 PRICE:$102.30 Colleague line-powered speakerphone...more info... Buy one	ITT ITT-2220 PRICE:$94.24 Colleague multi-feature telephone...more info... Buy one