The Teo ISDN Phone 8810 is a deluxe 10-key (expandable to 40-key) ISDN telephone. Key labels, call status, and more are shown on a large LCD graphic display. Automatic set-up capability and simple programming makes the phone quick to install and easy to use. Automatic set-up capabilities and simple programming make the phones quick to install and easy to use. Reliable and never obsolete, new feature enhancements and upgrades can be added easily. The 8810 model can also be upgraded to support IP service in the future.

Optional Terminal Adapters can be used simultaneously with the 8030X Button Expansion Module. In addition to the features of the 8610 and 8620 models, the 8810 model offers a headset jack, dedicated keys for menu navigation, headset, and voice mail, a voice mail function menu, 100-entry Speed Dial Directory, and enhanced information displays.

Available with a "U" interface (built-in NT1), or an "S/T" interface (requires an external NT1). "S/T" models are powered by PS1 (phantom) or PS2 (pins 7 and 8) power over the ISDN line cord. Power is typically supplied by the NT1. "U" models can be locally powered, or remotely powered by a bulk supply using PS2 power over the ISDN line cord. Power supplies are available separately. Small-screen models with 10 or 20 keys, the 8610 and 8620 models, are also available.

The 8810 model is on the DSN Approved Products List. Products on this list have received Joint Interoperability Certification (JIC) and Information Assurance Accreditation (IAA) from the Defense Information System Network (DISN) Designated Approval Authorities (DAA) in accordance with the Department of Defense Instruction DoDI 8100.3.