Chapter 3 Configuring the Cisco ATA for H.323

Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation

4.The Cisco ATA contacts the TFTP server and downloads the Cisco ATA release software that contains the correct signaling image for the Cisco ATA to function properly.

Note If you are not using a TFTP server, you need to manually upgrade the Cisco ATA to the correct signaling image. For information on this procedure, see the “Upgrading the Signaling Image Manually” section on page 8-2.

5.The Cisco ATA looks for a Cisco ATA-specific configuration file (designated by the MAC address of the Cisco ATA and named ata<macaddress>) on the TFTP server and downloads this file if it exists.

6.If the Cisco ATA does not find the ata<macaddress> configuration file, it looks for the atadefault.cfg configuration file and downloads this file if it exists. This file can contain default values for the Cisco ATA to use.

Note When the Cisco ATA is downloading its DHCP configuration, the function button on the top panel blinks.

Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation

If you want the Cisco ATA to use a preconfigured VLAN ID instead of using the Cisco Discovery Protocol to locate a VLAN, or if you want to disable VLAN IP encapsulation, refer to Table 3-1for a reference to the parameters and bits you may need to configure. Use the voice configuration menu to configure these parameters. (See the “Voice Configuration Menu” section on page 3-15for instructions on using this menu.) Also, refer to Table 3-2for a matrix on which VLAN-related parameters and bits to configure depending on your network environment.

Table 3-1 Parameters and Bits for Preconfiguring a VLAN ID

Parameter and Bits

Reference

OpFlags:

OpFlags, page 5-33

• Bit 4—Enable the use of user-specified voice VLAN ID.

 

• Bit 5—Disable VLAN encapsulation

 

• Bit 6—Disable CDP discovery.

 

 

 

VLANSetting:

VLANSetting, page 5-34

•Bits 0-2—Specify VLAN CoS bit value (802.1P priority) for TCP packets.

•Bits 3-5—Specify VLAN CoS bit value (802.1P priority) for UDP packets

•Bits 18-29—User-specified 802.1Q VLAN ID

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)

 

OL-4008-01

3-3

 

 

 

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Cisco Systems ATA 188 manual Parameter and Bits Reference, OpFlags, VLANSetting
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ATA 188 specifications

The Cisco Systems ATA 188 is a versatile Analog Telephone Adapter designed to facilitate the integration of traditional telephone systems with Voice over Internet Protocol (VoIP) networks. This device has been key in bridging the gap between legacy telephony and modern IP-based communication, allowing users to leverage their existing analog phones while enjoying the benefits of digital connectivity.

One of the main features of the ATA 188 is its ability to connect regular analog phones to a VoIP network, enabling users to make and receive calls over the internet. This significantly reduces calling costs, especially for long-distance and international calls. The ATA 188 supports two phone lines, allowing simultaneous voice calls. This dual-line capability makes it a suitable choice for small businesses or home offices that require multiple lines without the need for extensive infrastructure.

The device is equipped with various technologies that enhance its functionality. It supports the Session Initiation Protocol (SIP) and H.323, making it compatible with a wide range of VoIP service providers. Additionally, the ATA 188 features Quality of Service (QoS) settings, which prioritize voice traffic over the internet, ensuring clear voice quality without interruptions or delays. This is essential for maintaining a professional communication experience, especially in business environments.

Another characteristic of the ATA 188 is its user-friendly configuration interface. It allows users to easily set up and manage their devices through a web-based portal. The configuration process is straightforward, with options to adjust settings such as codec selection, call features including call waiting, and call forwarding functionalities.

Security is also a priority for the ATA 188, as it provides robust protocols to protect call data. The device supports Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS) to encrypt voice traffic and manage signaling securely. This ensures that sensitive conversations remain confidential.

Overall, the Cisco Systems ATA 188 is a reliable and efficient solution for users looking to transition from traditional telephony to VoIP. Its dual-line capacity, compatibility with multiple VoIP standards, user-friendly configuration, and built-in security features make it a valuable asset for both personal and professional communication solutions. In an ever-evolving telecommunications landscape, the ATA 188 remains a relevant and practical choice for integrating legacy telephony with modern internet-based services.
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