You're aware that Echolink is a Microsoft software program and it is
closed source, not a Linux program, correct? Additionally, the
Echolink web site recommends using Echolink with a DSL or Broadband
connection to the Internet. Use by wireless may work as well as via
telephone but not optimally.

I don't understand why it has been suggested that you run Firestarter
(Linux firewall software) to access UDP ports.

[quote]EchoLink is a computer program that runs under Microsoft
Windows to allow radio amateurs to communicate with one another using
Voice over IP (VoIP) technology on the internet for at least part of
the path between them. It was designed by Jonathan Taylor, a radio
amateur with callsign K1RFD.[/quote]

IRLP runs on the Linux operating system but requires that you BUY a
proprietary commercial interface, and it is used only for linking
repeaters together. No home users are permitted.

I found a web site that explains an Echolink 'like' program for
Unix/Linux, http://cqinet.sourceforge.net/. CQiNet is a family of
programs that combine Ham Radio with the Internet using Voice over IP
(VoIP) technology. Two programs are currently in the family,
"theBridge" and echoLinux.