Nortel Modular ICS 6.0 Installer's Manual page 583

Possible problem
The remote caller may have entered an asterisk (*) as one of
the six digits.
Solution
Instruct remote callers to enter their COS password correctly:
enter six digits.
Possible problem
The remote caller may have entered a number sign (#) as one
of the six digits.
Solution
Instruct remote callers to enter their COS password correctly:
enter six digits. The number sign (#) may be entered after the
sixth digit, but is not required.
Possible problem
The remote caller may have waited more than 15 seconds
between entering digits.
Solution
Instruct remote callers to enter their COS password correctly:
enter six digits, and do not pause too long between digits.
Possible problem
The caller may be dialing from a rotary-dial telephone or from
a push-button telephone that uses pulse signaling.
Solution
Inform remote callers that they must dial from a push-button
telephone that uses DTMF tone signaling.
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Problems for network or remote users / 583
Modular ICS 6.0 Installer Guide