Chapter 4 Basic and Additional H.323 Services

Important Basic H.323 Services

If LoginID1 and LoginID2 are not used or are not set to identical values, the Cisco ATA uses dual-registration mode.

Related Parameters

•LoginID0, page 5-13

•LoginID1, page 5-14

•UID0, page 5-10

•UID1, page 5-11

Setting Up Gatekeeper Time-To-Live Value

You can specify the valid duration of the H.323 gatekeeper registration, in seconds, by using the GkTimeToLive parameter.

Related Configuration Parameter

GkTimeToLive, page 5-17

Setting Up an Alternate H.323 Gatekeeper

To provide redundancy in systems that use an H.323 gatekeeper, the Cisco ATA allows you to either statically configure an alternate H.323 gatekeeper or dynamically assign an H.323 gatekeeper.

To enable the static alternate gatekeeper feature, you need to configure the AltGk parameter with the IP address assigned to the alternate H.323 gatekeeper. To enable the Cisco ATA to perform full gatekeeper registration when it switches to a statically configured alternate H.323 gatekeeper, configure Bit 3 of the ConnectMode parameter to the value of 1.

To enable the dynamic alternate gatekeeper feature, you need to configure the primary H.323 gatekeeper so that the list of alternate gatekeepers is included in the H.225 RAS messages that the H.323 gatekeeper sends to the Cisco ATA. The Cisco ATA can accept as many as four dynamic alternate gatekeepers configured in the H.225 RAS messages. (The Cisco ATA supports the alternate gatekeeper list in GCF/GRJ, ACF/ARJ, RCF/RRJ, and DRJ RAS messages.)

Dynamic alternate gatekeepers and static alternate gatekeepers can co-exist. When the Cisco ATA receives an alternate gatekeeper list in an H.225 RAS message, the static alternate gatekeeper is merged with the dynamic alternate gatekeepers. The static alternate gatekeeper is kept and given the lowest priority.

You can configure the AltGkTimeout parameter to specify the number of seconds the Cisco ATA should wait before it automatically switches back to the primary H.323 gatekeeper after being moved to an alternate gatekeeper. By default, the switch-back procedure is disabled (the AltGkTimeout parameter value is set to 0).

Related Configuration Parameters

•AltGk, page 5-16

•AltGkTimeOut, page 5-16

•ConnectMode, page 5-28

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

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Cisco Systems ATA 188 manual Setting Up Gatekeeper Time-To-Live Value, Setting Up an Alternate H.323 Gatekeeper
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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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