Webex Room Phone Technical Specifications

Cisco Discovery Protocol (CDP)

A device can use CDP to both receive information about other devices in the network as well as advertise its own existence to the other devices in the network.

With the use of CDP, the phone is able to transmit information with the Cisco Catalyst switch. This information includes things like the auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information.

Dynamic Host Configuration Protocol (DHCP)

The Dynamic Host Configuration Protocol (DHCP) enables you to connect the phone to the network and have it become operational without the need to manually assign an IP address or to set extra network parameters. This is made possible by the fact that the DHCP protocol is used.

By default, DHCP is set to be activated. In the event that this setting is deactivated, you will be required to manually establish the IP address, subnet mask, gateway, and a TFTP server on each phone in its respective location.

It is strongly suggested that you go with DHCP custom option 150. Using this method, you will need to configure the option value to be the IP address of the TFTP server. Consult the documentation that corresponds to the version of Cisco Unified Communications Manager that you are using for further information about the DHCP settings that are supported.

If you are unable to use option 150, you should use the DHCP option 66 instead.

Hypertext Transfer Protocol (HTTP)

The Hypertext Transfer Protocol, or HTTP, is the standard protocol for moving information and documents across the Internet and the World Wide Web.

Phones utilize HTTP for XML service provisioning, update, and troubleshooting, as well as for general troubleshooting needs.

Hypertext Transfer Protocol Secure (HTTPS)

The Hypertext Transfer Protocol safe, often known as HTTPS, combines the Hypertext Transfer Protocol with the SSL/TLS protocol in order to offer encryption and safe identification of servers. HTTP is the acronym for “hypertext transfer protocol.”

If the user is connected to the service through HTTPS, a lock icon will be presented to them on the screen.

A client-server-based access control and authentication protocol is defined by the IEEE 802.1X standard. This protocol prevents unauthorized clients from connecting to a local area network (LAN) using ports that are available to the general public.

Only traffic using the Extensible Authentication Protocol over LAN (EAPOL) will be permitted through the port that the client is linked to by the 802.1X access control system until the user has successfully authenticated the client. Once authentication has been completed successfully, normal traffic will be allowed to travel through the port.

The EAP-FAST and EAP-TLS authentication protocols are supported on the phone as a means of the IEEE 802.1X standard’s successful implementation on the phone.

Internet Protocol (IP)

IP stands for Internet technology and is a messaging technology that addresses and transmits data packets across a network.

If you are utilizing the Dynamic Host Configuration Protocol (DHCP) on your phone, then IP addresses, subnets, and gateway identifications will be automatically assigned. In the event that you are not utilizing DHCP, you will be required to manually assign these settings to each phone on a local level.

IPv6 address capability is included with the phones. Consult the documentation that corresponds to the version of Cisco Unified Communications Manager that you are using to obtain additional details.

LLDP is a standardized network discovery protocol that is very similar to CDP. It is supported on some Cisco equipment as well as devices made by third-party manufacturers.

On the LAN port, the phone has support for LLDP.

Link Layer Discovery Protocol-Media Endpoint Devices (LLDP-MED)

The LLDP standard was originally established for speech products, and LLDP-MED is an extension of that standard.

On the LAN port, the phone is equipped with support for LLDP-MED, which allows for the communication of information including:

• Voice VLAN configuration

• Device discovery

• Power management

• Inventory management

Real-Time Transport Protocol (RTP)

Real-time transport protocol, or RTP, is a standard protocol for transmitting real-time data over data networks. Real-time data includes interactive speech and video.

In order to send and receive real-time voice traffic from other phones and gateways, telephones make use of a protocol known as RTP.

Real-Time Control Protocol (RTCP)

Phones send and receive real-time voice traffic from other phones and gateways via the RTP protocol.

RTCP is enabled by default.

Session Description Protocol (SDP)

The part of the SIP protocol known as SDP is responsible for determining which parameters can be accessed while a connection is established between two endpoints. Establishing a conference requires making use of only those SDP capabilities that are supported by all endpoints participating in the conference.

SDP capabilities, such as codec kinds, DTMF detection, and comfort noise, are often configured on a global level by Cisco Unified Communications Manager or Media Gateway in operation. This can be done in a number of different ways. It’s possible that some SIP endpoints will let you configure these settings directly on the endpoint itself.

Session Initiation Protocol (SIP)

The Internet Engineering Task Force (IETF) has adopted SIP as the standard for conducting multimedia conferences using IP. SIP stands for Session Initiation Protocol. It is an application-layer control protocol that uses the ASCII encoding standard and is defined in RFC 3261. It can be used to initiate, maintain, and terminate calls between two or more endpoints.

SIP, like other VoIP protocols, is meant to address the functions of signaling and session management inside a packet telephony network. However, unlike other VoIP protocols, SIP was developed specifically for this purpose. The transmission of call information across network boundaries is made possible via signaling. Controlling the characteristics of a call from beginning to conclusion is made possible through the utilization of session management.

Secure Real-Time Transfer protocol (SRTP)

The Secure Real-Time Transport Protocol (SRTP) is an extension of the Real-Time Protocol (RTP) Audio/Video Profile. It maintains the integrity of RTP and Real-Time Control Protocol (RTCP) packets and provides authentication, integrity, and encryption of media packets that are transmitted between two endpoints.

Phones use SRTP for media encryption.

Transmission Control Protocol (TCP)

TCP is a connection-oriented transport protocol.

To connect to Cisco Unified Communications Manager and gain access to XML services, phones make use of the TCP protocol.

Transport Layer Security (TLS)

TLS (Transport Layer Security) is a technology that is widely used to secure and authenticate connections.

The TLS protocol is utilized by telephones in the event that security is enabled. This allows for the telephones to securely register with the Cisco Unified Communications Manager. Consult the documentation that corresponds to the version of Cisco Unified Communications Manager that you are using to obtain additional details.

Trivial File Transfer Protocol (TFTP)

TFTP on the phone gives you the ability to retrieve a configuration file that is unique to the type of phone being used.

Consult the documentation that corresponds to the version of Cisco Unified Communications Manager that you are using to obtain additional details.

User Datagram Protocol (UDP)

UDP stands for “user datagram protocol,” and it is a connectionless messaging mechanism that delivers data packets.