Chapter 3 Configuring the Cisco IP Phone Models 7905G and 7912G for SIP

Default Boot Load Behavior

network connectivity. However, if your network does not use a DHCP server, you must manually configure the IP address of the phone, the subnet mask used by the phone, and the network gateway (default router) IP address for the phone.

All Cisco IP Phones are shipped with a bootload image. However, because this image is not a fully-functional signaling image, the image must be upgraded. The image is designed to be automatically upgraded by a properly configured TFTP server. To configure the Cisco IP Phone to automatically upgrade to the latest signaling image, see the “Upgradecode Parameter Detail” section on page 8-41.

In addition, the Cisco IP Phone obtains its configuration file during the bootload process.

Here is a summary of the default Cisco IP Phone behavior during its boot-up process:

1.The Cisco IP Phone uses the Cisco Discovery Protocol (CDP) to discover which VLAN to enter. If the phone receives a VLAN ID response from the network switch, the phone enters that VLAN and adds 802.1Q VLAN tags to its IP packets. If the phone does not receive a response with a VLAN ID from the network switch, the phone assumes it is not operating in a VLAN environment and does not perform VLAN tagging on its packets.

Note If your network environment is not set up to handle this default behavior, make the necessary configuration changes by referring to the “Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation” section on page 3-4.

2.The phone contacts the DHCP server to request its own IP address.

Note If your network does not use a DHCP server, you must manually configure the IP address of the phone, the subnet mask used by the phone, and the network gateway (default router) IP address for the phone. For more information, see the “Minimum Configuration Settings for the Cisco IP Phone Models 7905G and 7912G” section on page 3-9.

3.The phone also requests the IP address of the TFTP server from the DHCP server.

 

 

Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)

 

 

 

 

 

 

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7912G, 7905G specifications

Cisco Systems is a leading provider of networking and telecommunications equipment, and among its extensive range of products, the Cisco 7900 Series of IP phones has made a notable impact in enterprise communication. Key models in this series include the Cisco 7905G, 7912G, and 7902G, each designed to enhance productivity through advanced features, intuitive interfaces, and robust technology.

The Cisco 7905G is designed for basic telephony needs and is ideal for administrative environments or areas with high call volumes. It features a large single-line LCD display, providing users with clear visibility of call information. The phone supports Power over Ethernet (PoE), making installation easier and reducing clutter by eliminating the need for an additional power supply. Its hands-free and headset support enhances user convenience, allowing for easy multitasking during calls.

Moving on to the Cisco 7912G, this model is designed for more demanding communication requirements. It features a larger, backlit display, providing improved visibility in various lighting conditions. The Cisco 7912G supports up to 12 programmable line or feature keys, giving users the flexibility to tailor the phone to their specific needs. Additionally, it incorporates advanced audio technologies, such as wideband audio for enhanced voice clarity and a built-in speakerphone, allowing users to communicate effectively in busy environments.

The Cisco 7902G, while offering basic features, is a reliable choice for users who need straightforward, cost-effective telephony solutions. It features an intuitive design with three dedicated buttons for line status, a built-in speakerphone, and support for wideband audio. The phone is geared for users who require essential telephony features without the complexity of additional functionalities, making it suitable for front-desk and general office use.

Overall, these models within the Cisco 7900 series exemplify the company's commitment to providing high-quality enterprise communication tools. With a focus on advanced audio technologies, user-friendly interfaces, and adaptability to various business environments, the Cisco 7905G, 7912G, and 7902G cater to the diverse needs of modern organizations. As companies continue to pursue seamless communication, these IP phones remain a valuable asset in their telephony infrastructure, enhancing collaboration and productivity among teams everywhere.
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