Chances are, if you're considering VoIP implementation, you've heard of
Asterisk -- the open source PBX. Asterisk can save your company a ton of money
-- especially in software license and upgrade fees.
Have you ever found that your phone bills are rising? Or you now have
extended your company to more than 1 employee and would like to add
extensions. Well with the Linux asterisk you can do that plus more. The
benefits are, Cheap phone calls using your broadband line, As many
extensions as you want, Music on Hold, Digital Receptionist, Voicemail. Also
all internal calls between your phones will be free. The phone will need an
ATA ( analogue telephone adapter) but these can be located not just in the
same room but anywhere that there is a broadband connection.