Hi Brian,
Right, this is a bit trickier, in fact very tricky indeed with the current Net::Appliance::Session design (which is why I am working on version 2 at the moment - hope to release in the New Year).
I'm going to have to ask my colleague for access to our own Cisco Call Manager and have a look for myself. I'll get back to you when I have done that, whether it's good news or not!
regards,
oliver.