ADTRAN’s Business Networking and Cloud Connectivity solutions provide SMB and enterprises with high performance, secure and reliable connectivity.  ADTRAN is the market- leading vendor for VoIP Access and SIP Trunking.  An extensive product portfolio includes: virtual wireless LAN and wireless access points, unified communications, IP PBX and converged IP telephony systems, business-class SIP phones, IP business gateways, managed PoE and gigabit switches and access routers.