A LinePresenceMonitor is an object that is used in the ACD-like clients to receive the presence state change notifitcation from the dialog/presence monitor
The PtEvent encapulates data associated with an event notification. The PtEvent is sent to an application implementing a PtEventListener by the Pingtel object in which the event occurs
In the MEDIA_LOCAL_START and MEDIA_REMOTE_START events the SIPX_CODEC_INFO structure is being passed up to the event handler and contains information about the negotiated audio and video codec