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http://jonathanmanning.com/2009/10/29/monitoring-agents-in-asterisk-with-chanspy/

Example 3: This example will give the ability to dial directly into an agents phone to listen to them.

[internal] ;Chanspy Direct SIP Extension
exten => _88XXXX,1,Chanspy(SIP/${EXTEN:2}|b)

Here you can dial directly into any agents 4 digit phone extension and listen to them, for example if you wanted to listen to sip extension 5400 then dial 88+5400. That would dial directly into monitoring phone extension number 5400. If your phones only have 3 digits remove one of the “X”‘s from the exten line.