Chapter 4 Basic and Additional SIP Services

Additional SIP Services

Table 4-2 Additional SIP Services (continued)

SIP Service

Description

Reference

 

 

 

NAT/PAT

To maintain Network Address Translation/Port

See the “SIP Parameters”

translation

Address Translation (NAT/PAT) for a session, the

section on page 8-9.

 

Cisco IP Phone can be configured to periodically send

 

 

a dummy UDP packet to a server (the phone does not

 

 

expect any response from the server).

 

 

To specify this configuration, use these parameters:

 

 

NatTimer—Bits 0 to 11 are for specifying the

 

 

retransmission period.

 

 

NatServer—Specifies the server to which the

 

 

dummy packet is sent.

 

 

 

 

Network timing

You can fine tune your network timing by making the

See the “Network

 

following settings:

Parameters” section on

 

Use the TimeZone parameter to specify the

page 8-2 and the “Audio

 

Parameters” section on

 

time-stamp for incoming calls (offset from

 

page 8-24.

 

Greenwich Mean Time).

 

 

 

Use the NTPIP parameter to specify the IP address

 

 

of the Network Time Protocol (NTP) server. NTP

 

 

is a protocol built on top of TCP that ensures

 

 

accurate local time-keeping with reference to radio

 

 

and atomic clocks located on the Internet.

 

 

Use the AltNTPIP parameter to specify an

 

 

alternate NTP server IP address.

 

 

Use the ConnectMode parameter to specify the

 

 

connection mode of the SIP protocol.

 

 

 

 

 

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

4-8

OL-4277-01

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Cisco Systems 7905G, 7912G manual Nat/Pat

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.