High Reliability Systems AT&T Lucent Avaya

Definity PBX


We carry a large variety of Definity digital and analog phones including 2400 series phones, 4600 series IP phones, 6400 series phones, 7400 series phones, 8400 series phones, 2500 series analog phones and more! If you can't find it anywhere else, odds are, we have it! We specialize in new and refurbished units.

Circuit Packs

We also carry a large variety of circuit packs for System 75, Definity G1/G3 and Definity G3R. From common control to port circuit packs, we've got you covered. We have many new and refurbished circuit packs to choose from.

Hard-to-find items

We have many hard-to-find items for the Definity including battery packs for SCC and MCC cabinets, air filters for SCC, MCC and Prologix cabinets, backup media and more! Call us today to find the parts you're looking for!

For more information contact sales@highreliabilitysystems.com or call us directly at 262-243-3200.