Gets the exception related to the state change or null. If an exception is present, it may be used to distinguish reasons for state transitions. A value of null does not necessarily indicate success.

Gets whether the results of the state change will also be reported directly to the application due to a method call. For example, an exception encountered by calling Invite would be reported both where Invite was called, and in the state change. An application written to handle errors when it makes method calls should only need to handle results reported in the state change only (IsMethodResult==false).

Gets the NOTIFY message received for the implicit subscription created for a transfer request sent earlier in this call.

Gets the previous state for the object.

Gets the rest of the SIP fragment body.

Gets the new state for the object.

Gets the status code received in the SIP fragment contained in the SIP NOTIFY.

Gets the status text received in the SIP fragment contained in the SIP NOTIFY.