The Mission Machines G400 phone system are Loaded with All Desired Popular Features Such As Voice Mail, Music On Hold, Paging, Simultaneous Ringing of Your Office Extension and Your Cell Phone and more. Other Features Include: Multi-Layer Automated Attendant, Call Queues, Conference Bridge, DID (Direct Inward Dialing) Support, Ring Groups, General Mailbox, Virtual Mailboxes, Voicemail to Email Notification, Music On Hold, 3-Way Conference, Browser Based System Administration and Much More! The G400 System Supports up to 50 system extensions and up to 20 concurrent Incoming and/or Outgoing calls. Add Unlimited Extensions And Only Pay For The Number Of Required Lines. Add Extensions At Your Office, Your Home Office or Use Smartphone Apps – No Additional Monthly Fees Apply. For More Information Call Our US-Based Customer Service Center 1-800-666-6646 M-F 9am to 6pm EST. Plug-N-Play Do It Yourself Installation. We Also Offer Complete Nationwide On-Site Installation (Available at Additional Cost) Anywhere in the Lower 48 States. 100% Satisfaction Guaranteed! One (1) Year Manufacturers Hardware Warranty is Included & 30 Days No Questions Asked Free Returns. Please Save All Original System Packaging for Easy Return Procedure. If you Need a Different Package Mission Machines Can Create a Custom Configuration that Matches Your Exact Needs – Please Contact Us (Send A Message Through Amazon)