Description
Product Overview of the Cisco CP-8851-K9 2 Ports Standard IP Phone
The Cisco CP-8851-K9 Unified 8851 IP Phone is a communication device designed to make voice calls over the Internet, also known as Voice over Internet Protocol (VoIP). In this comprehensive overview, we’ll delve into the features and functionalities of this phone, breaking down its specifications in easy-to-understand terms. With its capability to support 2 ports and 5 lines, this phone is a reliable and standard solution for business communication needs.
Key Features
Voice over Internet Protocol (VoIP)
The CP-8851-K9 operates on Voice over Internet Protocol, a technology that allows voice communication over the Internet. This enables users to make calls using the internet network instead of traditional telephone lines, providing flexibility and potentially reducing communication costs.
2 Ports and 5 Lines
This Cisco IP phone comes equipped with 2 ports, allowing it to connect to different devices or networks simultaneously. Additionally, it supports up to 5 lines, enabling users to manage multiple calls and extensions efficiently.
Standard IP Phone
As a standard IP phone, the Cisco CP-8851-K9 offers fundamental calling features commonly expected in business communication devices. It provides capabilities like call hold, transfer, conference calls, and call waiting, enhancing the productivity and functionality of the phone.
Technical SpecificationsVoice over Internet Protocol (VoIP)
Internet-Based Calling
This IP phone uses the internet to transmit voice data, converting it into digital signals. It relies on internet connectivity rather than traditional phone lines, allowing for more flexible and potentially cost-effective communication.
VoIP Protocols
The CP-8851-K9 supports various VoIP protocols, ensuring compatibility with different VoIP systems and services. Common protocols include SIP (Session Initiation Protocol) and SCCP (Skinny Client Control Protocol).
2 Ports and 5 LinesDual Ports
With 2 ports, this IP phone can connect to multiple devices or networks simultaneously. It allows for flexibility in usage, such as connecting to both a computer and a network switch.
Multi-Line Support
Supporting up to 5 lines, the phone accommodates multiple incoming and outgoing calls simultaneously. This feature is beneficial for businesses with high call volumes or multiple departments/extensions.
Standard IP Phone FeaturesCall Management
The CP-8851-K9 provides essential call management features, including call hold, transfer, conference calls, and call waiting. These functionalities enhance call handling efficiency for users.
High-Quality Audio
Equipped with high-quality audio technology, this IP phone ensures clear voice transmission, improving the overall communication experience.
Additional Features
Compatibility
The Cisco CP-8851-K9 is designed to work seamlessly with various VoIP systems and platforms, ensuring compatibility and easy integration into existing communication infrastructures.
Display and Interface
The phone features a user-friendly interface with an intuitive display, making it easy to navigate menus and access phone functions. This enhances user experience and ease of use.
Power over Ethernet (PoE)
The phone may support Power over Ethernet, allowing it to receive power through the Ethernet cable, eliminating the need for a separate power source.
User Interface and Navigation
The Cisco Unified 8851 Model 2 Ports Standard VoIP IP Phone (CP-8851-K9) has a user-friendly interface that allows users to easily access the phone’s features and functions. The phone features a 5-inch widescreen display with a resolution of 800 x 480 pixels, which provides a clear and detailed view of the phone’s menus, directories, and call logs.
The phone has a touch-sensitive color display that is used to navigate through menus and select options. The display is customizable and can be used to display user-selected wallpaper, as well as a range of different screensavers.
The phone also has physical buttons, including a keypad for dialing phone numbers, a speakerphone button for activating the phone’s hands-free speakerphone mode, and dedicated buttons for accessing voicemail, directory, and call history.
The navigation of the phone is intuitive, with a simple menu system that is easy to navigate. The home screen provides access to a range of features, including phone status, call logs, directories, and settings. The phone’s menu system can be accessed by pressing the menu button, which provides access to a range of additional options and settings.
The phone also has a number of shortcut buttons that allow users to quickly access frequently used features, such as mute, hold, transfer, and conference calling.
Security Considerations
The Cisco Unified 8851 IP Phone (CP-8851-K9) is designed to provide secure and reliable communications in enterprise environments. Here are some security considerations for this model:
- Authentication: The phone supports multiple authentication methods such as 802.1X, EAP-FAST, EAP-TLS, and PEAP. This ensures that only authorized users can access the phone and the network.
- Encryption: The phone supports secure communication using Transport Layer Security (TLS) and Secure Real-Time Transport Protocol (SRTP) for voice traffic. This provides end-to-end encryption to protect against eavesdropping and tampering.
- Firewall traversal: The phone supports Session Initiation Protocol (SIP) and Skinny Client Control Protocol (SCCP) and can traverse through firewalls using NAT and port forwarding. This ensures that the phone can be used in secure network environments.
- Access control: The phone supports access control lists (ACLs) and can restrict access to specific IP addresses or networks. This helps to prevent unauthorized access to the phone and the network.
- Firmware updates: The phone supports automatic firmware updates and can be configured to only accept signed firmware images. This ensures that the phone remains up-to-date with the latest security patches and that only authorized firmware can be installed.
- Physical security: The phone has a Kensington security slot and can be physically secured to prevent theft or unauthorized removal.
- Management security: The phone can be configured using Secure Shell (SSH) or Secure HTTP (HTTPS) for secure remote management. This ensures that the phone can be managed securely from a central
Sound Quality and Acoustics
The CP-8851-K9 Cisco Unified 8851 Model is a standard IP phone designed for enterprise-level communication. As an electronic device, it has a built-in speaker and microphone to enable sound communication, and the quality of these components directly affects the sound quality of the phone.
Sound quality refers to how accurately the sound produced by the phone’s speaker and picked up by the microphone represents the original sound source. In the case of a phone, this means that the person on the other end of the line should be able to hear the speaker’s voice clearly and without distortion, and the speaker should be able to hear the other person’s voice clearly as well.
Acoustics refers to the study of how sound behaves in different environments, and in the case of a phone, this includes how sound travels through the air and how it is affected by the phone’s physical properties. The design of the CP-8851-K9 phone takes these acoustic factors into account to optimize sound quality.
The CP-8851-K9 phone has a full-duplex speakerphone with acoustic echo cancellation, which means that both parties can speak and listen at the same time without the sound being distorted by echoes or feedback. It also has a noise-canceling microphone that filters out background noise and improves the clarity of the speaker’s voice.
In terms of acoustics, the phone has a frequency response range of 100 Hz to 7 kHz, which is sufficient for speech communication but may not be suitable for listening to music or other audio content. The phone also has two ports for external headset and auxiliary audio devices, which can further enhance the sound quality for users who require it.
General Information about this Cisco 5 Lines Phone
- Manufacturer: Cisco
- Model Number or SKU# CP-8851-K9
- Product Series: 8800
- Product Type: Technology VoIP
Technical Information for 8851 Model IP Phone
- IP Phone Unified 8851 Standard IP Phone
- Connectivity Technology Cable
- Caller ID: Yes
- Speakerphone: Yes
- Voice Codec-
- G.711a
- G.711u
- G.722
- G.729a
- iLBC
- iSAC
- Dialer Type Keypad
Interfaces/Ports of CP-8851-K9 Unified 8800 Series
- Network (RJ-45): Yes
- Number of Network (RJ-45) Ports: 2
- USB: Yes
- Headset Port: Yes
- PoE (RJ-45) Port: Yes
Display and Graphics
- Screen Type LCD
- Backlight Yes
- Screen Size 5 Inch
- Screen Resolution 800 x 480
Controls / Indicators
- Buttons & Keys Type-
- Programmable
- Directory
- Message
- Line Select
- Navigation
- Hold Button
- Call Transfer
- Conference
- Volume Control
- Speaker
- Headset
- Mute
Compatibility
- Cisco Unified Communications Manager – 8.5.1, 8.6.2, 9.1.2, and 10.0 and later; requires an Enhanced User Connect License (UCL) in order to connect to Cisco Unified Communications Manager
- Cisco Unified Communications Manager Express (Unified CME) – 10.0 and later through fast track
- Cisco Business Edition 6000 (BE 6000) – 8.6.2, 9.1.2, 10.0 and later
- Cisco Hosted Collaboration Solution (HCS) – 8.6.2 and later (using supported UCM versions and above)
In conclusion, the Cisco CP-8851-K9 Unified 8851 IP Phone is a reliable and standard communication device suitable for businesses seeking a VoIP solution. With its support for 2 ports, 5 lines, standard IP phone features, and compatibility with various VoIP protocols, this phone offers essential functionalities for effective communication. Whether it’s managing multiple calls, leveraging internet-based calling, or ensuring high-quality audio, the CP-8851-K9 is a dependable choice for businesses looking to enhance their communication systems.
