Troubleshooting 73

AT commands do not appear.

¥To see the commands that you type in a HyperTerminal window, you must Disconnect, then Connect again.

Using HyperTerminal, the message “Unable to open COMx port” appears.

¥The CTA 500dm may be in use by another application (for instance, Dial-Up Networking).

Data call problem?

Data calls are not answered automatically.

¥Make sure that rings until answer S0 is not set to 0. See ÒS- registersÓ on page 41 for more information.

¥If the rings until answer value is too high, the calling device may time out.

Data calls are answered but are terminated too soon.

¥Make sure that you are calling the correct device.

¥Make sure that the remote device is set to the same rate adaptation protocol as the CTA 500dm. See ÒRate adaptation protocol speciÞcationsÓ on page 80 for more information.

¥Make sure that the proper authentication protocols are used at both ends and that your ID and password are correct.

¥If the data rate is set to 64 kbit/s, the network may not be able to support 64 kbit/s. Try connecting at 56 kbit/s. See ÒOutgoing Call Control commands summaryÓ on page 47 to change your data rate.

The CTA 500dm rejects calls.

¥Make sure the CTA 500dm is conÞgured to accept calls and that the call type (bearer capability) and call rate are set correctly. See ÒIncoming Call Control commands summaryÓ on page 49 for more information.

¥ÒAllow caller accessÓ may not be enabled in Installing Dial-Up Server conÞguration.

The CTA 500dm aborts calls when dialing.

¥This may be the any key abort feature of the dial command. See ÒDial CommandÓ on page 44 for more information.

¥The CTA 500dm may not be seizing a line. Check that the correct line pool code or external dial digit is used in Dialing

P0873832 Issue 05

CTA 500dm On Line Guide

Page 73
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Nortel Networks CTA 500dm manual Data call problem?

CTA 500dm specifications

Nortel Networks CTA 500dm is a versatile and robust communications technology platform specifically designed to enhance network solutions for businesses and organizations. With a keen focus on delivering high-performance connectivity, the CTA 500dm serves as a critical component in managing voice, video, and data traffic within a unified communications environment.

One of the standout features of the CTA 500dm is its scalability. The platform supports a variety of deployment scenarios, making it suitable for organizations of varying sizes, from small businesses to large enterprises. This scalability allows for seamless upgrades and expansions, ensuring that businesses can adapt their network solutions to meet evolving demands without requiring a complete overhaul of their existing infrastructure.

The CTA 500dm incorporates advanced technologies such as Session Initiation Protocol (SIP), which is essential for facilitating real-time communication sessions, including VoIP calls and video conferencing. SIP allows for the integration of various communication channels, providing users with a unified experience while streamlining management for IT teams. Moreover, the platform supports Quality of Service (QoS) mechanisms, which help prioritize voice and video traffic to ensure optimal performance, reducing latency and enhancing the overall user experience.

Another characteristic of the CTA 500dm is its comprehensive security features. The platform includes robust encryption methods and authentication protocols to safeguard data and voice communications from potential threats. This is particularly vital in an era where cyber threats are increasingly sophisticated, ensuring that organizations can maintain secure operations while conducting vital communications.

Furthermore, the CTA 500dm is designed with user-friendliness in mind. Its intuitive interface simplifies management and configuration tasks, allowing IT administrators to efficiently oversee the system without requiring extensive training or specialized knowledge. Coupled with extensive monitoring and reporting tools, administrators can gain valuable insights into network performance and troubleshoot issues proactively.

In conclusion, the Nortel Networks CTA 500dm stands out as a powerful solution for organizations looking to optimize their communication infrastructure. With its scalability, support for advanced technologies like SIP, strong security features, and user-friendly management capabilities, the CTA 500dm delivers a comprehensive platform for modern communications, ensuring that businesses remain connected, productive, and secure in today’s fast-paced digital landscape.