IP Telephony Security Issues

[BRIAN RUE <BRIANRUE@AUD.STATE.FL.US>]

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Anyone have an idea on the security issues facing networks with the
advent of IP Telephony and the streaming of voice and data packets?  I'm
starting to hear rumblings in this direction from several sites visited
recently that are seriously looking at IPTEL solutions.  Could this be a
firewall issue and if so have vendors factored this into current
products?

Thanks for any help in advance.

Brian Rue