[Freeswitch-users] Retrieve active call from voicemail

Hi, Does anyone know how to retrieve an active call from the voicemail system? I have googled and checked the lists but couldn't find anything. At a previous employer we had this feature so if you were heading back to your desk to answer the phone and it had gone to VM, you could retrieve the call if the calling party was in the process of leaving a message. This was a very useful feature as it saved time in listening to messages and returning calls. Dean