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We have had many different phone systems in our office over the years.  Some have cost a small fortune.  Four years ago I scrapped our existing phone system an bought a 4-Line Multi-Handset Cordless Phone System from Panasonic.  The base station is the only unit that has to br plugged into the phone jacks.  All of the other phones connect to the base unit via 2.4 GHz Frequency-Hopping Spread Spectrum Technology.  This gives us four lines, caller ID,an answering system and intercom between phones.  The base station is $499.  Cordless handsets are $129 each and you can add up to eight. 

http://www2.panasonic.com/webapp/wcs/stores/servlet/vModelDetail?displayTab=O&storeId=15001&catalogId=13401&itemId=62850&catGroupId=25041&modelNo=KX-TG4000B&surfModel=KX-TG4000B&cacheProgram=11002&cachePartner=7000000000000005702