Also, many of the IP telephony vendors are now focused on SIP as the controlprotocol for their IP telephony deployments.
另外，许多IP电话技术供应商现在都把SIP作为IP电话技术部署的控制协议。
2
TCP is a transport protocol providing transmission of data over IP networks, and IP is a network protocol containing addressing and control information that allow for data to be routed.