ISP-Planet: An Asterisk Appliance

"This week, Morganville, N.J.-based Ranch Networks announced the development of security code for Asterisk, the open source VoIP project, that allows enterprises to combine Asterisk with Ranch appliances. The code is certified by Huntsville, Ala.-based Digium and is available in the latest Asterisk version, number 1.2.3.

"The code uses a standard developed by the IETF called Middlebox Communications to open firewall ports only when a call is actually in progress. This should make enterprise firewalls far more secure..."

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• TG Daily: SoCal Linux Expo Preview: ODF, KDE4, Asterisk on the Agenda(Jan 21, 2006)
• OSDir: From Analog to VoIP: Asterisk Brings Telephony Together Under One Open-Source Platform(Jan 18, 2006)
• Internetnews.com: GNU Telephony Stack Opens Up VoIP(Dec 30, 2005)
• Enterprise Networking Planet: DIY Telephony With Asterisk, Part 3(Dec 12, 2005)