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

To communicate using IP, network

 

 

 

addresses and sends packets across

devices must have an assigned IP

 

 

 

the network.

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.

 

 

 

Real-Time Transport

RTP is a standard protocol for

Cisco Unified IP Phones use the RTP

Protocol (RTP)

transporting real-time data, such as

protocol to send and receive

 

 

 

interactive voice and video, over data

real-time voice traffic from other

 

 

 

networks.

phones and gateways.

 

 

 

Secure Real-Time

SRTP is available in addition to RTP.

For SRTP to work, the phone or

Transport Protocol

SRTP adds security by encrypting

phones being called must also

(SRTP)

media streams during data transport.

support SRTP or else those phones

 

 

 

 

cannot decrypt the secure media

 

 

 

 

stream.

 

 

 

Skinny Client Control

SCCP includes a messaging set that

Cisco Unified IP Phones use SCCP

Protocol (SCCP)

allows communications between call

for call control.

 

 

 

control servers and endpoint clients

 

 

 

 

 

such as IP Phones. SCCP is

 

 

 

 

 

proprietary to Cisco Systems.

 

 

 

 

 

Transmission Control

TCP is a connection-oriented

Cisco Unified IP Phones use TCP to

Protocol (TCP)

transport protocol.

connect to

 

 

 

 

Cisco Unified CallManager and to

 

 

 

 

access XML services.

 

 

 

Transport Layer

TLS is a standard protocol for

When security is implemented,

Security (TLS)

securing and authenticating

Cisco Unified IP Phones use the TLS

 

 

 

communications.

protocol when securely registering

 

 

 

 

with Cisco Unified CallManager.

 

 

 

 

 

 

 

 

Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager

 

 

1-6

 

 

 

OL-10008-01

 

 

 

 

 

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Cisco Systems 7906G, 7911G manual Srtp

7906G, 7911G specifications

The Cisco Systems 7911G is a versatile IP phone designed to enhance communication in enterprise environments. Targeting workers in various organizational settings, this model is known for its reliability, ease of use, and robust features that cater to both basic and advanced telephony requirements.

One of the key features of the Cisco 7911G is its support for Voice over IP (VoIP) technology. Using this technology allows for the transmission of voice signals over the internet rather than through traditional telephone lines. This not only reduces telephony costs but also offers enhanced functionality that integrates seamlessly with existing communication systems.

The phone is equipped with a monochrome graphical display that provides users with clear visibility of their call status, directory information, and menu options. With a resolution of 128x64 pixels, the screen is large enough to offer important information without overwhelming the user. This simplicity makes it an ideal choice for users who require straightforward functionality without the complexity of advanced features.

Ergonomically designed, the Cisco 7911G features a comfortable keypad with dedicated buttons for frequently used functions such as mute, hold, and transfer. It supports multiple lines, providing users with the ability to manage multiple calls simultaneously. Additionally, it offers programmable line keys that can be customized for speed dial or as soft keys for quick access to features.

The device supports Power over Ethernet (PoE), which allows the phone to receive power through the network cable rather than needing a separate power source. This feature not only simplifies installation but also enhances mobility within the workspace, as it reduces cable clutter.

Another significant characteristic of the Cisco 7911G is its compatibility with Cisco Unified Communications Manager, which ensures centralized management of telephony systems. It also supports a range of audio codecs that help in delivering high-quality audio during calls, reducing latency and improving overall communication quality.

Security is also a focus with the Cisco 7911G, as it features a secure access feature that includes Transport Layer Security (TLS) and Secure Real-Time Transport Protocol (SRTP) for encrypted voice communications. This ensures that sensitive conversations are protected from eavesdropping.

Overall, the Cisco Systems 7911G is a reliable, feature-rich IP phone that provides an excellent solution for organizations looking to upgrade their communication systems. Its combination of user-friendly design, powerful integrations, and security features makes it a cornerstone in the suite of Cisco telecommunications solutions.