[Freeswitch-users] Is possible from dialplan to detect if called party is online?

[Fabio Pietrosanti (naif)]

There some condition that let to check if the called party is  
currently registered and online, before giving the called a return code?

We need to manage a condition where the called number is an iPhone and  
is usually "always offline" and we need to wakeup the voip client with  
a "push notifcation".

But before doing the push notification we should check if the user is  
already registered/online or not.

Don't know which path to follow

Fabio