a) Is SIP a signaling protocol or a transp ort p rotocol? b) Describe ho\,• SIP initiates a con1munication session. a) In a VoIP traffic transport packet, what does the data field contain? b) What...

a) Is SIP a signaling protocol or a transp ort p rotocol? b) Describe ho\,• SIP initiates a con1munication session. a) In a VoIP traffic transport packet, what does the data field contain? b) What standard is used at the transport layer? c) What two lin1ita tions of UDP does the RTP address?