Yes. I good platform is asterisk (Note the spelling when searching) it is a SIP based platform. It runs on a really low spec machine, is linux, and even comes with a nice pre built installation called AsteriskNOW. (It is GUI managed as well)
There are many free softbased SIP clients that are easy to use I use X-lite but there are others.
You do not need to punch any holes in your firewall to get it to work (inband and outbound calls) and can support a large number of phones (depends on platform of course).
You need to have a little knowledge of SIP and alot of Internet VoIP providers support connectivity and will even supply the configuration for you to connect.
For the real hardcore asterisk users you can purchase a FXS/FXO PCI card to allow you to connect Fax lines (FXS) and terminate on a PSTN analogue line (FXO)
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Yes. I good platform is asterisk (Note the spelling when searching) it is a SIP based platform. It runs on a really low spec machine, is linux, and even comes with a nice pre built installation called AsteriskNOW. (It is GUI managed as well)
There are many free softbased SIP clients that are easy to use I use X-lite but there are others.
You do not need to punch any holes in your firewall to get it to work (inband and outbound calls) and can support a large number of phones (depends on platform of course).
You need to have a little knowledge of SIP and alot of Internet VoIP providers support connectivity and will even supply the configuration for you to connect.
For the real hardcore asterisk users you can purchase a FXS/FXO PCI card to allow you to connect Fax lines (FXS) and terminate on a PSTN analogue line (FXO)