Our Systems Advanced Telecom Sells the Very Best in Technology, including but not limited to: E-Metro Tel, Avaya, Nortel, Cisco, Yealink, Poly, Grand stream, Snom, NEC, and XBlue Nortel E-Metrotel Avaya NEC Xblue Our Locations Austin, Texas Phone: 512-487-6461 Dallas, Texas Phone: 214-556-5853 Houston, Texas Phone: 281-823-8098 San Antonio, Texas Phone: 210-245-8047