[Freeswitch-users] PC Based Caller-id Monitor?

Hi All, My client has their DID ringing 2 extensions. He says "at night when they are gone I would love to have caller id from their extension (aka did) to decide if I want to pick up the outside call" He does not want his phone to ring from the DID all the time, but wants the caller-id on his phone or PC. I need ideas how to accomplish this. ESL app? The app would not necessarily have to monitor for incoming calls if there is a way to "query" the caller id of an incoming call to a given extension. Thanks, Sean