Simple PBX for POTS

I have a very small business with POTS lines.  I can't use VOIP here because I don't have access to Broadband.  I'd like to install a basic PBX to screen and route calls (Sales calls vs. Service calls), enable me to transfer calls to another extension, etc....  I have 3 lines now and will need a maximum capacity of 4 lines.  Can I buy an "off the shelf" product with these capabilities?
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Talkswitch are plug and play and have good functionality.

The linked unit does 4 phone lines and supports both analog and network phones so you could use any old phone or get a more advanced IP based phones.  I think a total of 16 phone sets with the system linked and up to 8 can be analog.

There are some good Asterisk based options that work fine with analog phones but these routes do involve some hardware setup and software setup.  Though not that hard is is not 'off the shelf' and ready to just plug in.

Most newer network based phone systems will support traditional analog phone lines either through line cards or ATA's (analog terminal adapters) or analog gateways.


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Not everyone wants to deal with the open source systems - keeps the "off-the-shelf" suppliers in business.  
If you want a traditional PBX style system there are several on the market with digital phones and analog extensions.  Many have built in auto attendant and voice mail.  Good sellers include the Toshiba DK series, or the Avaya Partner; there is also an abundance of used systems on the marketplace as well.
If you want IP phones instead of digital (although for a small business there is rarely any significant advantage), you can still get a traditional manufacturer's product (such as the Toshiba CTX, Panasonic NCP, and Avaya IP Office) that supports a variety of "endpoint" options.  If you need local support, there are small firms that specialize in these products almost anywhere.  If you want to put in in and program yourself. you can browse for these products.
I'd say a Nortel MICS and a CallPilot (VM).  There are loads available on Ebay or other supply houses.  It is an old system but they are fairly bulletproof, there are many techs and parts available.
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