Appendix C SIP Call Flows

Call Flow Scenarios for Successful Calls

The following types of responses are used by SIP and generated by the Cisco SIP gateway:

SIP 1xx—Informational responses

SIP 2xx—Successful responses

SIP 3xx—Redirection responses

SIP 4xx—Client Failure responses

SIP 5xx—Server Failure responses

SIP 6xx—Global Failure responses

Call Flow Scenarios for Successful Calls

This section describes call flows for the following scenarios:

Cisco IP Phone-to-SIPServer—Registrationwithout Authentication, page C-2

Cisco IP Phone-to-SIP Server—Registration with Authentication, page C-4

Cisco IP Phone-to-Cisco IP Phone—Basic SIP to SIP Call without Authentication, page C-7

Cisco IP Phone-to-Cisco IP Phone—Basic SIP to SIP Call with Authentication, page C-15

Each of the call flows includes a call diagram, action descriptions table, and a sample log file.

Cisco IP Phone-to-SIP Server—Registration without Authentication

Figure C-1illustrates the Cisco IP Phone registering with the SIP server where authentication is not required for registration. Table C-1describes these actions in detail. Table C-2shows the log of these actions.

The call flow is as follows:

1.Cisco IP Phone requests registration.

2.Registration is completed.

 

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

C-2

OL-4277-01

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Cisco Systems 7905G, 7912G manual Call Flow Scenarios for Successful Calls

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.