Cisco CP-7975G Administration Guide - Page 23

Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols are Used? Table 1-2 Supported Networking Protocols on the Cisco Unified IP Phone (continued) Networking Protocol Purpose Usage Notes Session Description Protocol (SDP) SDP is the portion of the SIP protocol that determines which parameters are available during a connection between two endpoints. Conferences are established using only the SDP capabilities that are supported by all endpoints in the conference. SDP capabilities, such as codec types, DTMF detection, and comfort noise, are normally configured on a global basis by Cisco Unified Communications Manager or Media Gateway in operation. Some SIP endpoints may allow these parameters to be configured on the endpoint itself. Transmission Control Protocol (TCP) TCP is a connection-oriented 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. For more information, refer to the Cisco Unified Communications Manager Security Guide. 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. For more information, refer to Cisco TFTP in the Cisco Unified Communications Manager System Guide. User Datagram Protocol (UDP) UDP is a connectionless messaging protocol Cisco Unified IP Phones transmit and receive for delivery of data packets. RTP streams, which utilize UDP. IPv6 Support on Cisco Unified IP Phones The Cisco Unified IP Phone uses the internet protocol to provide voice communication over the network. Previous to Cisco Unified Communications Manager release 8.0, only the internet protocol version 4 (IPv4) was supported. Because it uses a 32-bit address, IPv4 cannot meet the increased demands for unique IP addresses for all devices that can connect to the internet. Internet Protocol version 6 (IPv6) is an updated version of the current Internet Protocol, IPv4. IPv6 uses a 128-bit address and provides end-to-end security capabilities, enhanced Quality of Service (QoS), and increased number of available IP addresses. The Cisco Unified IP Phone supports IPv4 only addressing mode, IPv6 only addressing mode, as well as an IPv4/IPv6 dual stack addressing mode. In IPv4, you can enter each octet of the IP address on the phone in dotted decimal notation; for example, 192.240.22.5. In IPv6, you can enter each octet of the IP address in hexadecimal notation with each octet separated by a colon; for example, 2005:db8:0:1:ef8:9876:ba72:dc9a. The phone truncates and removes leading zeros when it displays the IPv6 address. OL-23092-01 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5 1-9