Cisco 7931G Administration Guide - Page 27
Cisco Unified IP Phones use TCP - set time
UPC - 882658128578
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Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols Are Used? Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued) Networking Protocol Purpose Usage Notes Real-Time Transport Protocol (RTP) RTCP works in conjunction with RTP to provide QoS data (such as jitter, latency, and round trip delay) on RTP streams. RTCP is disabled by default, but you can enable it on a per phone basis using Cisco Unified Communications Manager. For more information, see the "Network Configuration Menu" section on page 4-7. Skinny Client Control Protocol (SCCP) SCCP includes a messaging set that allows communications between call control servers and endpoint clients such as IP Phones. SCCP is proprietary to Cisco Systems. Cisco Unified IP Phones use SCCP for call control. Transmission Control TCP is a connection-oriented Protocol (TCP) transport protocol. Cisco Unified IP Phones use TCP to connect to Cisco Unified Communications Manager and to access XML services. Transport Layer Security (TLS) TLS is a standard protocol for securing and authenticating communications. When security is implemented, Cisco Unified IP Phones use the TLS protocol when securely registering with Cisco Unified Communications Manager. Trivial File Transfer Protocol (TFTP) TFTP allows you to transfer files over the network. On the Cisco Unified IP Phone, TFTP enables you to obtain a configuration file specific to the phone type. TFTP requires a TFTP server in your network, which can be automatically identified from the DHCP server. If you want a phone to use a TFTP server other than the one specified by the DHCP server, you must manually assign TFTP server from the Network Configuration menu on the phone. User Datagram Protocol UDP is a connectionless messaging Cisco Unified IP Phones transmit and (UDP) protocol for delivery of data packets. receive RTP streams, which utilize UDP. Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0 OL-12457-01 1-9