Cisco CP-7940G-CH1 Administration Guide - Page 16
What Networking Protocols Are Used - sip
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What Networking Protocols Are Used? Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols Are Used? Cisco Unified IP Phones support several industry-standard and Cisco networking protocols required for voice communication. Table 1-1 provides an overview of the networking protocols that the Cisco Unified IP Phones 7960G and 7940G support. Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone Networking Protocol Bootstrap Protocol (BootP) Cisco Discovery Protocol (CDP) Dynamic Host Configuration Protocol (DHCP) Hypertext Transfer Protocol (HTTP) Internet Protocol (IP) Real-Time Transport (RTP) Session Initiation Protocol (SIP) Purpose Usage Notes BootP enables a network device such as the Cisco Unified IP Phone to discover certain startup information, such as its IP address. If you are using BootP to assign IP addresses to the Cisco Unified IP Phone, the BOOTP Server option shows "Yes" in the network configuration settings on the phone. CDP is a device-discovery protocol that runs on all Cisco-manufactured equipment. Using CDP, a device can advertise its existence to other devices and receive information about other devices in the network. The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. DHCP dynamically allocates and assigns an IP address to network devices. DHCP enables you to connect an IP phone into the network and have it become operational without you needing to manually assign an IP address or configure additional required network parameters. DHCP is enabled by default. If disabled, you must manually configure the IP address, subnet mask, gateway, and a TFTP server on each phone locally. Cisco recommends that you use DHCP custom option 150. With this method, you configure the TFTP server IP address as the option value. For additional supported DHCP configurations, refer Cisco Unified Communications Manager System Guide. HTTP is the standard way of transferring information and moving documents across the Internet and the web. Cisco Unified IP Phones use HTTP for the XML services and for troubleshooting purposes. IP is a messaging protocol that addresses and sends packets across the network. To communicate using IP, network devices 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. RTP is a standard protocol for transporting 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. SIP is an emerging standard for setting up telephone calls, multimedia conferencing, and other types of communications on the Internet. Cisco Unified IP Phones use SCCP for call control. You can configure the Cisco Unified IP Phone to use either SCCP or SIP. Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP) 1-4 OL-15498-01