Vodavi Starplus DHS SP-7000-00 Key Service Unit (Refurbished)The basic DHS system is perfect for a small business. Starting with 3 lines and 8 stations, it can easily expand up to 12 lines and 16 stations or 9 lines and 24 stations. For businesses that need more lines than the basic DHS system, Vodavi's DHS E is ready with expanded capabilities for up to 18 lines and 48 stations. For larger organizations needing more capacity to grow in their telephone systems, DHS L offers flexible systems starting at 8 lines