SipReceived180Ringing

This event informs the application software that the far end SIP device has responded to an invitation to take part in a call. The far end is stating that it is "Ringing" the far end phone.

Note:
This is the first provisional event your application can receive that does reflect the actual activity of the call destination. If you receive this event, it is because the far end has sent you the "ringing" provisional response. This event is not generated due to intermediate SIP proxy behavior.