The atl berkshire 5000 voip telephone complements atl39s range of voice products the berkshire 5000 is atl telecom39s business class voice over ip telephone based on the sip ip protocol that is widely used in todays emerging ip convergence business environment the berkshire 5000 telephone has the latest integrated voice and data technology offering high performance and high quality it is a solution that is cost effective while maintaining the berkshire pedigree the berkshire 5000 voip