Business Telephone Sales sells Avaya Partner Phone Systems complete and Avaya Partner Phone System Replacement parts such as Partner Processors and Partner Expansion Cards. Business Telephone Sales has been selling the Lucent Partner and Avaya Partner phone systems since they were first manufactured and can help with all of your Partner phone system needs at the best prices. Business Telephone Sales also sells replacement Partner Phones and Partner Accessories. If you are not sure what phones will work on your Avaya Partner telephone system, please feel free to ask. If you do not see what you are looking for, please call 800-396-9699 or email us.