American Telephone Company's SIP (Session Initiation Protocol) has become a catalytic force helping shape today's telecommunications industry. Our SIP service is designed for organizations of all sizes and provides calling packages to meet the needs of your business.


  • NO MORE RATE CENTER RESTRICTIONS! Port existing numbers to ATC's SIP product from any major telecom provider
  • DID/DOD service available
  • Turn ups in days not weeks
  • 24/7/365 monitoring
  • Disaster recovery routing


  • Add additional call paths in hours
  • Utilize our bandwidth or yours


  • Lower usage related charges
  • Volume and term discount plans provide substantial savings on already competitive ATC rates