Cisco 521SG Administration Guide - Page 138

Configuring Security, Quality, and Network Features Configuring Domain and Internet Settings 5 • Dynamic Host Configuration Protocol (DHCP) receives an IP address from the network DHCP server. Cisco SPA IP phones typically operate in a network where a DHCP server assigns the devices their IP addresses. Because IP addresses are a limited resource, the DHCP server periodically renews the device lease on the IP address. If a phone loses its IP address for any reason, or if some other device on the network is assigned its IP address, the communication between the SIP proxy and the phone is either severed or degraded. Whenever an expected SIP response is not received within a programmable amount of time after the corresponding SIP command is sent, the DHCP Timeout on Renewal parameter causes the device to request a renewal of its IP address. If the DHCP server returns the IP address that it originally assigned to the phone, the DHCP assignment is presumed to be operating correctly. Otherwise, the phone resets to try to fix the issue. • Static IP-A static IP address for the phone. • PPPoE-Point-to-Point Protocol over Ethernet (PPPoE) connects users on an Ethernet network to the Internet through a common broadband medium, such as DSL line, wireless device, or cable modem. All users on an Ethernet share a common connection, so the Ethernet principles supporting multiple users in a LAN combine with the principles of PPP that apply to serial connections. To set the connection type, navigate to Admin Login > advanced > Voice > System. Under Internet Connection Type choose the Connection Type: • Dynamic Host Configuration Protocol (DHCP) • Static IP, and configure the following: - Static IP Address of the phone. - Netmask of the phone. - Gateway IP address If you are configuring a Cisco SPA525G or Cisco SPA525G2, also configure: - LAN MTU-LAN Maximum Transmission Unit size. Default value: 1500. - Duplex Mode-Choose the speed/duplex for the phone Ethernet ports: Auto, 10MBps/Duplex, 10MBps/Half, 100Mbps/Duplex, 100MBps/Half • PPPoE (PPPoE is only available on the Cisco SPA525G or Cisco SPA525G2), and configure the following: Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 137