Samsung phone System:                                

Designed for small to medium Business. supplies the latest digital technology. Supports Voice over Internet Protocol (VOIP),(Connect two or more sites through the Internet). Integrated Voice Mail and Auto Attendant. Protects your Investment by allowing you to use your existing Samsung Equipment and Phones as your business grows

ESI phone system features:
Easy-to-use interactive voice programming
Live call recording
T-1 support
64-key console
Automated attendant
Expandable
Up to 140 hours of voice mail storage
Headset operation function
Built in speakerphone
User, guest, and information mailboxes
Expand up to 66 incoming central office lines.
Expand up to 84 extensions.

Norstar phone system features:
Interactive display
Hands-free speakerphone
48 key lamp modules
Automatic set relocation
Automated attendant
Built in headset jack
User, guest and information mailboxes

Panasonic phone system features:
Extra device port for single line device
User, guest and information mailboxes
Display and non display phones
Monitor phones and speaker phones
Automated attendant