I'm a bit perplexed that it isn't working, but let's try to narrow it down a bit. It sounds like the talk server is not starting up. I trust that you have done everything I mentioned, but want to double check with you.
1) Show contents of /etc/xinetd.d/talk and /etc/xinetd.d/ntalk.
2) Result of rpm -q talk talk-server xinetd
3) Result of iptables -L | grep talk
If all this turns out fine we'll take a look at executing the talk command on the same host.
Bill
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