Asynchronously invokes the Hangup D-Bus method on this.
When the operation is finished, callback will be invoked in the thread-default main loop of the thread you are calling this
method from (see push_thread_default). You can then call call_hangup.end to get
the result of the operation.
See call_hangup_sync for the synchronous, blocking version of this method.
| this | |
| cancellable |
A Cancellable or |
| callback |
A TaskReadyCallback to call when the request is satisfied or |
| user_data |
User data to pass to |