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I know there are some solutions on IVRS and VoIP in some Linux distributions, but I am not sure which one is reliable and stable. Or should I custom build a Linux dedicated for these services?

Please give me some advices.

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closed as off-topic by Iain, dawud, masegaloeh, Flup, yagmoth555 May 31 at 12:38

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up vote 2 down vote accepted

Asterisk, running on whatever linux distribution you're comfortable with.

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seems a nice solution. Can it use VoIP ? – Raptor Aug 4 '10 at 2:20
Asterisk supports (at least) SIP and SCCP ("Skinny") more-or-less out of the box, so unless you have a very unusual environment, you should be good to go. – Vatine Aug 4 '10 at 12:14

Your best small based voip system is Asterisk. The only issue is that it doesnt have a gui. If you use freepbx it runs asterisk with a gui and gives you alot more customizing options.

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