Cisco 7975G Administration Guide - Page 19

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 Internet Protocol (IP) IP is a messaging protocol that addresses and To communicate using IP, network devices sends packets across the network. must have an assigned IP address, subnet, and gateway. IP addresses, subnets, and gateways identifications are automatically assigned if you are using the Cisco Unified IP Phone with Dynamic Host Configuration Protocol (DHCP). If you are not using DHCP, you must manually assign these properties to each phone locally. Cisco Peer to Peer Distribution Protocol (CPPDP) CPPDP is a Cisco proprietary protocol used to form a peer to peer hierarchy of devices. CPPDP is also used to copy firmware or other files from peer devices to neighboring devices. CPPDP is used by the Peer Firmware Sharing feature. Link Layer Discovery Protocol (LLDP) LLDP is a standardized network discovery The Cisco Unified IP Phone supports LLDP protocol (similar to CDP) that is supportedon on the PC port. some Cisco and third-party devices. Link Layer Discovery Protocol-Media Endpoint Devices (LLDP-MED) LLDP-MED is an extension of the LLDP standard developed for voice products. The Cisco Unified IP Phone supports LLDP-MED on the SW port to communicate information such as: • Voice VLAN configuration • Device discovery • Power management • Inventory management For more information about LLDP-MED support, see the LLDP-MED and Cisco Discovery Protocol white paper: http://www.cisco.com/en/US/tech/tk652/tk70 1/technologies_white_paper0900aecd804cd4 6d.shtml Real-Time Control Protocol (RTCP) RTCP works with Real-Time Transport Protocol (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 by using Cisco Unified Communications Manager Phone Configuration. For more information, see the "Network Configuration" section on page 4-25. Real-Time Transport Protocol RTP is a standard protocol for transporting (RTP) real-time data, such as interactive voice and video, over data networks. Cisco Unified IP Phones use the RTP protocol to send and receive real-time voice traffic from other phones and gateways. OL-14640-01 Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1 1-5