[Freeswitch-users] CHANNEL_HOLD / UNHOLD events

I'm using the event sockets to grab various bits of callstate, but don't get much luck with hold/unhold. If I switch on all events (event json all) so that I should be able to see everything, then I still don't see CHANNEL_HOLD / UNHOLD events when I issue uuid_hold commands for the call legs. I can see CHANNEL_CALLSTATE (held/active), so I know that the hold is working. However, if the client initiates the hold (such as switching between calls on Zoiper) then I do see CHANNEL_HOLD/UNHOLD as well as the CHANNEL_CALLSTATE (held/active). Would you expect it to work this way? I was rather hoping for explicit messages in response to the uuid_hold command. Regards, Martyn