Network Protocols(8800 only)
Cisco IP Phone 8800 Series support several industry-standard and Cisco network protocols required for voice communication. The following table provides an overview of the network protocols that the phones support.
Network protocol |
Purpose |
Usage notes |
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Bluetooth |
Bluetooth is a wireless personal area network (WPAN) protocol that specifies how devices communicate over short distances. |
Cisco IP Phones 8845, 8865, and 8851 support Bluetooth 4.1. Cisco IP Phone 8861 support Bluetooth 4.0. Cisco IP Phone 8811 and 8841 do not support Bluetooth. |
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Bootstrap Protocol (BootP) |
BootP enables a network device, such as the Cisco IP Phone, to discover certain startup information, such as the IP address. |
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Cisco Discovery Protocol (CDP) |
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 IP Phones use 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. |
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Dynamic Host Configuration Protocol (DHCP) |
DHCP dynamically allocates and assigns an IP address to network devices. DHCP enables you to connect an IP phone into the network and the phone to become operational without the need to manually assign an IP address or to configure additional network parameters. |
DHCP is enabled by default. If disabled, you must manually configure the IP address, subnet mask, and gateway on each phone locally.
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Hypertext Transfer Protocol (HTTP) |
HTTP is the standard way of transferring information and moving documents across the Internet and the web. |
Cisco IP Phones use the HTTP protocol for XML services, provisioning the phone, upgrading the phone, and for troubleshooting purposes. |
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Hypertext Transfer Protocol Secure (HTTPS) |
Hypertext Transfer Protocol Secure (HTTPS) is a combination of the Hypertext Transfer Protocol with the SSL/TLS protocol to provide encryption and secure identification of servers. |
Some Web applications support both HTTP and HTTPS protocols. Cisco IP Phones that support HTTPS use the HTTPS URL. |
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IEEE 802.1X |
The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized clients from connecting to a LAN through publicly accessible ports. Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass through the port. |
The Cisco IP Phone implements the IEEE 802.1X standard by providing support for the following authentication methods: EAP-FAST, and EAP-TLS. When 802.1X authentication is enabled on the phone, you should disable the PC port and voice VLAN. |
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IEEE 802.11n/802.11ac |
The IEEE 802.11 standard specifies how devices communication over a wireless local area network (WLAN). 802.11n operates at the 2.4 GHz and 5 GHz band and 802.11ac operates at the 5 GHz band. |
The 802.11 interface is a deployment option for cases when Ethernet cabling is unavailable or undesirable. Only Cisco IP Phone 8861 and 8865 support WLAN. |
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Internet Protocol (IP) |
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 gateway identifications are automatically assigned if you are using the Cisco IP Phone with Dynamic Host Configuration Protocol (DHCP). If you are not using DHCP, you must manually assign these properties to each phone locally. |
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Link Layer Discovery Protocol (LLDP) |
LLDP is a standardized network discovery protocol (similar to CDP) that is supported on some Cisco and third-party devices. |
The Cisco IP Phone supports LLDP on the PC port. |
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Link Layer Discovery Protocol-Media Endpoint Devices (LLDP-MED) |
LLDP-MED is an extension of the LLDP standard for voice products. |
The Cisco IP Phone supports LLDP-MED on the SW port to communicate information such as:
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/tk701/technologies_white_paper0900aecd804cd46d.shtml |
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Real-Time Transport Protocol (RTP) |
RTP is a standard protocol for transporting real-time data, such as interactive voice, over data networks. |
Cisco IP Phones use the RTP protocol to send and receive real-time voice traffic from other phones and gateways. |
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Real-Time Control Protocol (RTCP) |
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. |
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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 by using only the SDP capabilities that all endpoints in the conference support. |
SDP capabilities, such as codec types, DTMF detection, and comfort noise, are normally configured on a global basis by Third-Party Call Control System or Media Gateway in operation. Some SIP endpoints may allow configuration of these parameters on the endpoint itself. |
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Session Initiation Protocol (SIP) |
SIP is the Internet Engineering Task Force (IETF) standard for multimedia conferencing over IP. SIP is an ASCII-based application-layer control protocol (defined in RFC 3261) that can be used to establish, maintain, and terminate calls between two or more endpoints. |
Like other VoIP protocols, SIP addresses the functions of signaling and session management within a packet telephony network. Signaling allows transportation of call information across network boundaries. Session management provides the ability to control the attributes of an end-to-end call. Cisco IP Phones support the SIP protocol when the phones are operating in IPv6-only, IPv4-only, or in both IPv4 and IPv6. |
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Transmission Control Protocol (TCP) |
TCP is a connection-oriented transport protocol. |
Cisco IP Phones use TCP to connect to Third-Party Call Control system and to access XML services. |
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Transport Layer Security (TLS) |
TLS is a standard protocol for securing and authenticating communications. |
Upon security implementation, Cisco IP Phones use the TLS protocol when securely registering with Third-Party Call Control system. |
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Trivial File Transfer Protocol (TFTP) |
TFTP allows you to transfer files over the network. On the Cisco IP Phone, TFTP enables you to obtain a configuration file specific to the phone type. |
TFTP requires a TFTP server in your network that the DHCP server can automatically identify. |
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User Datagram Protocol (UDP) |
UDP is a connectionless messaging protocol for delivery of data packets. |
UDP is used only for RTP streams. SIP signaling on the phones do not support UDP. |