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Re:How To Create a Conference Call in 3 Lines of Code by wallflower on Monday November 23, 2009 @03:53PM (#958115)
I'd say it's highly likely they are using open-source Asterisk

http://www.asterisk.org/

Re:How To Create a Conference Call in 3 Lines of Code by abalashov on Tuesday November 24, 2009 @08:47AM (#959163)
They use some Asterisk. There is also a significant (and well-known) commercial component proprietary to the enhanced voice application services industry, although there are various reasons for which I cannot disclose what it is.
Re:How To Create a Conference Call in 3 Lines of Code by nico on Monday November 23, 2009 @06:42PM (#958391)
A better alternative to Asterisk: FreeSWITCH - www.freeswitch.org
Re:How To Create a Conference Call in 3 Lines of Code by Shooter on Monday November 23, 2009 @11:08PM (#958700)
We're slowly migrating most of our PBX/IVR apps from Asterisk to FreeSWITCH. I agree FreeSWITCH is higher quality code, but unfortunately there is a much smaller developer/support/hardware ecosystem with FreeSWITCH right now.
Re:How To Create a Conference Call in 3 Lines of Code by abalashov on Tuesday November 24, 2009 @08:47AM (#959164)
"Better" is very relative, as the sibling poster rightly points out.