Using an ATA behind a firewall

Using an ATA behind a firewall

See also pages 237-239 of Practical VoIP: Using VOCAL [Dang 2002]; particularly the example of using a Cisco ATA (Analog Telephone Adaptor) behind a Linksys firewall (which configures the firewall to pass incoming traffic on port 5060, 4000, and 4001 to the Cisco ATA) - which also refers to http://www.dyndns.org/ Links to an external site.

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Slide Notes

Luan Dang, Cullen Jennings, and David Kelly, Practical VoIP: Using VOCAL, O’Reilly, 2002, ISBN 0-596-00078-2.

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Transcript

[slide368] And in the book "Practical Voice over IP Using VOCAL", there's an example of how you set up one of those analog telephony adapters behind a Linksys firewall. And one of the common methods that's used, of course, is what do you do? You open the ports in your firewall, specifically that you are going to use, so ports 50, 60, and then a pair to be used for the RTP and RTCP traffic.