asterisk users - Aug 2005 - chanspy not working with Agents

I'm trying to spy on an agent (Agent/54321).

I can "dial(Agent/54321)" successfully.

If I "chanspy(Agent/54321)" or "chanspy(Agent)" all I get is
a series of
beeps.

Any clue where I should start looking?

Thanks in advance,
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Steve Edwards      sedwards@sedwards.com      Voice: +1-760-468-3867 PST
Newline           pagesteve@sedwards.com            Fax: +1-760-731-3000