Serving Greater Boston Our highly trained staff will provide top quality service on installation, programming, & repairs for your new or existing Avaya & Nortel phone systems. FREE QUOTE Clients TESTIMONIALS “Our phone system transition went perfectly—training was thorough and we have not had one issue since.” FROM NORTEL TO AVAYA? About Glotelco “Glotelco is a company that serves businesses in Massachusetts, New hampshire and Rhode Island. Our company takes pride on providing exceptional customer service. It all starts with what the customer needs, we want to build a long relationship with our customers to be part of the growth of their business, as they are part of ours.