Skype and SKYPE_CALL_PROPERTY topic

When making an outbound call to a skype contact I’m trying to pass some information about what the call is, like caller id. In the documentation it says I can set the “topic” of a call. I’ve set this using the snippet below however when receiving the call I don’t see the topic set anywhere?

exten => s,1,Set(SKYPE_CALL_PROPERTY(topic)=My Title)
exten => s,2,Dial(Skype/,20)

Anybody have any ideas or suggestions?

David.