Chapter 4 Basic and Additional H.323 Services

Important Basic H.323 Services

Using the Cisco ATA Without an H.323 Gatekeeper

You can use the Cisco ATA without using an H.323 gatekeeper, as this section describes with the following topics:

•Using the Cisco ATA With an H.323 Gateway but Without an H.323 Gatekeeper, page 4-6

•Using Multiple Cisco ATAs Without an H.323 Gatekeeper, page 4-6

Using the Cisco ATA With an H.323 Gateway but Without an H.323 Gatekeeper

You can use a Cisco ATA with an H.323 network that does not contain an H.323 gatekeeper. In this scenario, all calls initiated from the Cisco ATA are directed to a specified H.323 gateway. To specify this H.323 gateway, you configure its IP address using the Gateway parameter, and you disable the H.323 gatekeeper feature by setting the GkorProxy parameter to 0.

Note For all calls sent from the H.323 gateway to the Cisco ATA, the E.164 number assigned to each of the Cisco ATA FXS ports must be included in the H.225 Setup message, either in the DestinationAddress field or the Q.931 CalledPartyNumber field. The Cisco ATA will reject the call if it cannot find its E.164 number in the H.255 Setup message.

Related Configuration Parameters

•Gateway, page 5-12

•GkOrProxy, page 5-15

Using Multiple Cisco ATAs Without an H.323 Gatekeeper

You can make calls from one Cisco ATA to another Cisco ATA in an H.323 network that does not contain an H.323 gatekeeper.

For one Cisco ATA to access a specific FXS port on another Cisco ATA, you use an IP dialing procedure. The Cisco ATA originating the call must have the following information about the destination

Cisco ATA:

•E.164 phone number of the destination FXS port

•IP address of the destination Cisco ATA

To enable the IP dialing procedure, you need to set the IPDialPlan parameter to 1 to instruct the Cisco ATA to look for the destination IP address in the dialed digits.

Example

Cisco ATA X is going to initiate a call to Cisco ATA Y (with the following pertinent information):

•IP address of Cisco ATA Y—192.168.2.112.

•E.164 phone number for the Phone 1 port of Cisco ATA Y—1:5556666

•E.164 phone number for the Phone 2 port of Cisco ATA Y—2:5558888

To call the Phone 1 port on Cisco ATA Y, you would dial 5556666**192*168*2*112#.

To call the Phone 2 port on Cisco ATA Y, you would dial 5558888**192*168*2*112#.

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

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Cisco Systems ATA 188 manual Using the Cisco ATA Without an H.323 Gatekeeper, Gateway, GkOrProxy
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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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