Cisco SPA525G IP Phone
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Cisco SPA525G 5-line IP Phone PoE Wireless Local Area Refurbished

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Part Number#: SPA525G
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Short Description:
SPA525G 5 Line IP Phone with Color Display Power over Ethernet (PoE) Wireless Local Area Network (LAN) Standard Institute of Electrical and Electronics Engineers (IEEE) 802.11b/g | Made by Cisco | Refurbished
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days
Product Overview for the Cisco SPA525G 5-line IP Phone

This IP phone is equipped with various features, including a color display, Power over Ethernet (PoE), and Wireless Local Area Network (LAN) support using the Institute of Electrical and Electronics Engineers (IEEE) 802.11b/g standard. In this description, we will explore the Cisco SPA525G IP Phone, breaking down its features and benefits in simple English.

The Cisco SPA525G is a high-quality IP phone designed for professional use. It is particularly suitable for small to medium-sized businesses and offers numerous features that contribute to efficient and effective communication within an organization.

Five Lines for Enhanced Productivity

One of the standout features of the Cisco SPA525G LAN IP Phone is its support for up to five lines. This means that a single phone can manage five different phone lines or extensions, making it an excellent choice for employees who need to handle multiple calls simultaneously. Whether you're a receptionist, manager, or any other professional who frequently deals with phone calls, this feature can significantly boost your productivity.

Vibrant Color Display

The Cisco SPA525G boasts a color display, which is a notable improvement over traditional monochrome displays commonly found in older IP phones. This high-resolution color screen allows for a more intuitive and visually appealing user experience. The display is clear and easy to read, making it simple for users to navigate menus, view caller IDs, and access various phone features.

Power over Ethernet Support

Power over Ethernet, often abbreviated as PoE, is a technology that simplifies the installation and maintenance of network-connected devices like IP phones. The Cisco SPA525G supports PoE, which means it can receive both data and power through a single Ethernet cable. This eliminates the need for a separate power adapter, making installation more straightforward and cost-effective.

Wireless Local Area Network Connectivity

In addition to traditional wired Ethernet connectivity, the Cisco SPA525G also supports Wireless Local Area Network (LAN) connections using the IEEE 802.11b/g standard. This feature offers the flexibility to connect the IP phone to your network wirelessly, allowing users to move around the office freely without being tethered to a specific location.

HD Audio Quality

Effective communication heavily relies on audio quality. The Cisco SPA525G is equipped with high-definition (HD) audio, which means that your calls will be crystal clear. Whether you are making or receiving calls, the improved audio quality ensures that every word is heard accurately, reducing misunderstandings and improving overall call quality.

Secure Communication

Security is a significant concern in today's interconnected world. Cisco takes this issue seriously and ensures that the SPA525G is equipped with robust security features to protect your communications. It supports encryption protocols like Secure Sockets Layer (SSL) for secure provisioning and Session Initiation Protocol (SIP) over Transport Layer Security (TLS) for secure signaling.

Compatibility with Various VoIP Platforms

The Cisco SPA525G IP Phone is designed to work seamlessly with various Voice over Internet Protocol (VoIP) platforms. This means you can integrate it with popular VoIP services or on-premises PBX (Private Branch Exchange) systems. It's highly versatile and can be adapted to suit your specific communication needs.

Enhanced Productivity

The multiple-line support of the Cisco SPA525G means that employees can handle more calls simultaneously. Whether you're managing multiple clients, coordinating with team members, or providing customer support, the phone's features empower you to be more productive in your work.

Improved User Experience

The color display and intuitive interface of the Cisco SPA525G contribute to a better user experience. Users can navigate menus, view caller information, and access various features with ease. This user-friendliness can reduce the learning curve for new users and make daily tasks more efficient.


Power over Ethernet support eliminates the need for additional power adapters and outlets. This not only reduces installation costs but also simplifies cable management. It's particularly advantageous in scenarios where you have limited access to power outlets.

Flexibility and Mobility

The support for wireless LAN connectivity offers users the freedom to move around the office without being confined to a specific desk or location. This enhances workplace flexibility and can improve collaboration, especially in dynamic environments.

Crystal Clear Communication

The HD audio quality ensures that every conversation is clear and understandable. Whether you're conducting business calls, participating in conference calls, or handling customer inquiries, the audio quality of the Cisco SPA525G contributes to a professional image and better communication.

Enhanced Security

Security is a top priority, especially when it comes to business communications. The Cisco SPA525G's support for encryption protocols ensures that your calls and data are protected. This is critical for businesses that deal with sensitive or confidential information.

Versatility in VoIP Integration

The Cisco SPA525G is compatible with a wide range of VoIP platforms, giving businesses the flexibility to choose the service that best suits their needs. This versatility makes it a valuable asset for businesses of all sizes.

Importance of the IEEE 802.11b/g Standard

The Cisco SPA525G's support for Wireless LAN connectivity is made possible through the Institute of Electrical and Electronics Engineers (IEEE) 802.11b/g standard. Let's delve into the significance of this standard:

IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN) communication. The "b" and "g" refer to specific amendments within this standard.

  • 802.11b: This was one of the earliest WLAN standards. It operates in the 2.4 GHz frequency range and provides data rates of up to 11 Mbps. While it's relatively slower compared to modern standards like 802.11ac and 802.11ax, it still serves many basic wireless communication needs.
  • 802.11g: This amendment improved upon 802.11b by offering higher data rates, up to 54 Mbps. It also operates in the 2.4 GHz range, making it compatible with 802.11b devices. 802.11g brought faster and more reliable wireless communication to the masses.
IEEE 802.11b/g Matters for the Cisco SPA525G

The support for IEEE 802.11b/g in the Cisco SPA525G is significant for several reasons:

  • Backward Compatibility: 802.11b/g is backward compatible with older 802.11b devices. This means that the SPA525G can connect to both older and newer wireless networks, ensuring seamless integration into your existing network infrastructure.
  • Reliability: The use of the 2.4 GHz frequency range provides good coverage and is less susceptible to interference from physical obstacles. This makes it a reliable choice for wireless communication in an office environment.
  • Cost-Effective: 802.11b/g is a cost-effective solution for providing wireless LAN connectivity. It doesn't require expensive hardware, and many organizations have already invested in 802.11b/g infrastructure, making the Cisco SPA525G a practical choice.
  • Versatility: 802.11b/g is a versatile standard that is widely supported by many wireless access points and routers. This broad support ensures that the SPA525G can easily connect to your existing network.
IEEE 802.11b/g Wireless Connectivity

The wireless connectivity feature of the Cisco SPA525G IP Phone relies on the IEEE 802.11b/g standard. Let's break down what this standard means and how it plays a crucial role in enabling wireless LAN support.

Understanding IEEE 802.11b/g

The Institute of Electrical and Electronics Engineers (IEEE) is a professional association that sets standards for a wide range of technologies, including wireless networking. In the context of wireless LAN (Local Area Network), IEEE 802.11b and IEEE 802.11g are two prominent standards that have greatly influenced the world of wireless communication.

IEEE 802.11b

IEEE 802.11b, commonly referred to as Wi-Fi or simply 802.11b, was one of the first widely adopted wireless LAN standards. It was ratified in 1999 and operates in the 2.4 GHz frequency band. This standard offers a maximum data rate of 11 Mbps, making it suitable for basic data transmission and internet access. While it may not be as fast as more recent Wi-Fi standards, it provides reliable connectivity for a variety of applications.

The 2.4 GHz frequency used by 802.11b is a crowded spectrum, shared with various other devices like microwave ovens and cordless phones. This can lead to potential interference and reduced performance, particularly in densely populated areas or environments with many electronic devices.

IEEE 802.11g

IEEE 802.11g, introduced in 2003, built upon the foundation of 802.11b while providing significant improvements. This standard also operates in the 2.4 GHz frequency band but offers a higher maximum data rate of 54 Mbps. It brought a substantial speed boost while maintaining compatibility with 802.11b devices.

802.11g employs a modulation technique called Orthogonal Frequency Division Multiplexing (OFDM), which enhances data transmission reliability and minimizes interference. This made it a preferred choice for many wireless networks.


The IEEE 802.11b/g standard ensures that the Cisco SPA525G is compatible with a wide range of wireless networks and routers. It can seamlessly connect to both 802.11b and 802.11g networks, providing flexibility in various office environments.

Data Transfer Speed

With support for 802.11g, the phone can achieve a maximum data transfer speed of 54 Mbps. This is more than sufficient for handling voice calls, video conferencing, and data transfer within a typical business network. The high data rate ensures smooth and uninterrupted communication, even when multiple devices are connected to the network.

General Information about this Cisco SPA525G
  • Manufacturer: Cisco
  • Part Number or SKU# SPA525G
  • Product Series: 500
  • Product Type: Protocol IP Phone
Technical Information of Color Display IP Phone
  • Networking Device Type: Telephony Equipment
  • Wireless Technology: Wi-Fi
  • Wireless LAN Standard: IEEE 802.11b/g
  • Total Number of Phone Lines: 5
  • Green Compliant: Yes
  • Green Compliance Certificate/Authority: RoHS
  • A Full-featured and stylish 5-line business IP phone that supports up to two SPA500S (32 button) expansion modules.
  • Enhanced connectivity, including Power over Ethernet, 802.11g Wi-Fi client mode, and Bluetooth headset support.
  • High-resolution 3.2-inch QVGA 320 x 240 color screen with graphics.
  • Easy and secure wireless setup with industry-standard push-button WPS and quick provisioning capabilities for mass-scale service provider activation.
  • Embedded SSL VPN client for secure phone connectivity to your IPPBX over any public internet connection.
  • Support for multimedia functions such as playing MP3s, displaying digital photos, viewing RSS feeds, and displaying video surveillance camera streams.
  • Multiple features, including caller ID, call forwarding, call transfer, 3-way conferencing, call parking, call history, phonebook, and built-in full-duplex speakerphone.
  • Supports both SIP with SPA9000 or leading third-party call control platforms and SPCP Protocols with Cisco Unified Communication 500 Series.
Call Control and Audio Features
  • Call hold
  • Music on hold
  • Call waiting
  • Caller ID name and number, and outbound caller ID blocking
  • Caller ID mapping for incoming calls
  • Outbound caller ID blocking
  • Call transfer (attended or blind)
  • Call forwarding (unconditional, no answer, on busy)
  • Visual voice message waiting indicator (VMWI)
  • Shared/bridge line appearance
  • Call pickup (selective and group)
  • Call the park and unpark
  • Call back on busy
  • Call blocking (anonymous and selective)
  • Do not disturb
  • Intercom
  • Group paging
  • Extension mobility
  • Configurable dial/numbering plan support with interdigit timers per line
  • URL (IP) dialing support
  • Distinctive ringing based on calling and called number
  • Supplementary services feature activation codes
  • Supplementary services announcement codes
  • Configurable supplementary services soft keys
  • Individual volume setting per each audio path (headset/handset/speaker)
  • Password-protected system reset to factory default
  • Password-protected administrator and user access authority
  • HTTPS with factory-installed client certificate
  • HTTP digest-encrypted authentication via MD5 (RFC 1321)
  • Up to 256-bit Advanced Encryption Standard (AES) encryption
  • SIP over TLS for signaling encryption
  • Secure RTP for media encryption

In summary, the Cisco SPA525G 5 Line IP Phone with Color Display, Power over Ethernet (PoE), and Wireless LAN support using IEEE 802.11b/g is a valuable communication tool for businesses. Its numerous features, from multiple line support to high-definition audio quality, enhance productivity and user experience.

As businesses continue to rely on efficient communication, the Cisco SPA525G IP Phone remains a solid choice, providing the tools necessary to meet modern communication demands. Whether you're a small startup or a well-established enterprise, this IP phone can contribute to your success by facilitating clear and reliable communication.

Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

About Refurbished Products

Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.


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Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

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In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

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