asterisk users - Sep 2005 - Call Pickup between ZAP and SIP technologies

Hi,
 I have this scenario.
 In my desk I have a phone connected to a FXS module of my * server. On 
another desk there is a phone but it is a SIP softphone (SJphone).
I hear the SIP softphone is ringing, then I try to take that call with my 
Zap phone in my desk dialing *8, but I get fast busy tone.
 Is there I way do this to work ? I mean pickup phones that are ringing on 
different technologies ?
 Ardg.
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