if my office have 20 voip telephone can it talk to gether

if my office have 20 voip telephones can it talk to gether  our company want to use in our office How can i do that
teeraAsked:
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Visual3DMayaConnect With a Mentor Commented:
A broadband hard phone can communicate with another VoIP phone.
Here is 2 links that might help
http://www.ventrilo.com/
http://www.pcworld.idg.com.au/index.php/id;1649304761
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
What are you talking about?  You want to do interoffice calling/extension dialing?  The answer to that question is it depends on the service, but most would allow this.  If you mean you want to still do interoffice/extension dialing even when your internet connection goes down, then PROBABLY not, but again, it depends on the service and the hardware used.  
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Purple_SkyConnect With a Mentor Commented:
Certainly depends on the phone equipment in the company.
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