Here is differents info, I have found about your config problem:
For telnetd, some systems have "-h" to suppress the greeting and other systems' banners come from a file called something like /etc/issue. (Note that in redhat linux, you really want to modify /etc/rc.d/rc.local rather than (or in addition to) /etc/issue*, because it regenerates /etc/issue* upon boot.)
The banner printed by in.telnetd is configurable. The default is (more or less) equivalent to "`uname -sr`" and will be used if no banner is set in /etc/default/telnetd. To set the banner, add a line of the form
to /etc/default/telnetd. Nonempty banner strings are fed to shells for evaluation. The default banner may be obtained by
BANNER="\\r\\n\\r\\n`uname -s` `uname -r`\\r\\n\\r\\n"
and no banner will be printed if /etc/default/telnetd contains
Hope, this 'll help you