Which one of the following statements about SIP is FALSE?

The Via header field indicates the transport used for the transaction.

The Contact header field provides a SIP or SIPS URI that can be used to contact that specific instance of the UA for subsequent requests.

A SIP transaction consists of a single request and any responses to that request, which include zero or more provisional responses and one or more final responses.

A dialog is identified at each UA with a dialog ID, which consists of a Call-ID value, a Contact and a Request URI.