The Cortelco ITT-2500 series is a classic single-line analog desk phone that features a push-button keypad and a rotary-style design.
They are fully corded and require no batteries or AC power.
No, they feature a push-button dial with a rotary-style layout.
The colors and features related to volume control are as follows: ASH represents gray, BK represents black, RD represents red, and VOE indicates a volume-enhanced model.
Yes, all models are compatible with hearing aids.
Only VOE models include handset volume adjustment switches.
Yes, wall mounting is possible for all models.
No, it operates using the phone line’s power.
Yes, by using an Analog Telephone Adapter (ATA).
It uses a standard RJ11 telephone jack.
Coiled handset cord stretches to about 9 feet; line cord is 6 feet long.
No, just plug and use. Ensure the tone/pulse dial matches your setup.
Yes, manually from a switch on the base.
Yes, large buttons and simplicity make them ideal.
No, this is a basic unit without redial.
The phone does not come with a mute feature.
Yes, it’s perfect for institutions due to its reliability.
Yes, works with all analog line providers.
It is compatible with the majority of analog PBX configurations.
Yes, it’s compatible with fax/modem systems.
No headset jack is available.
Yes, since it draws power from the phone line.
Yes: ash/beige, red, and black.
The handset is made from durable ABS plastic.
It’s sturdy but not heavy—ideal for frequent use.
Check listings—some units may still be U.S.-manufactured.
Typically, a two-year warranty is provided.
Yes, an analog landline or VoIP service is required.
Visit USA Trading Depot for cords and accessories.
Place it near your main phone jack—ideal for desks or wall mounts.
Cortelco ITT-2500 Series, see here
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