Follow along with the video below to see how to install our site as a web app on your home screen.
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AT&T VDNA (Voice DNA)
http://www.business.att.com/enterprise/Family/business-voip-enterprise/voice-dna-enterprise/
EDIT: Guess I should also note that we are using about 125 Polycom 650's with Adtran PoE switches. Four sites, each with a dedicated T1 for VoIP, though not entirely necessary. You may want to check on the compatibility of those units.
ANOTHER EDIT: List of phones supported. http://rawrgv.com/?v=vdna.png i'd still double check with them.