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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Signaling Tracing

Signaling Tracing

This topic describes the purpose and implementation principles of signaling tracing fault diagnosis feature.


Based on your requirements, VBD fault diagnosis may obtain some contents of users' communications (integrity communication contents are not obtained and user information will not be disclosed) for the purpose of safeguarding network operations and protecting services. Huawei alone is unable to collect or save the content of users' communications. You must comply with the laws and regulations of the countries concerned for using the VBD fault diagnosis feature. You are obligated to take considerable measures to ensure that the content of users' communications is fully protected when the content is being used and saved.


After the OLT is running on the network and voice service failures occur, such as poor communication quality, low fax/modem service success rate, one-way audio, and no audio, easy signaling tracing (instead of remote packet capture) can be used to obtain voice signaling streams and further these signaling streams can be used for fast fault locating.

Signaling tracing features:
  • Remote fault locating: Fault locating can be remotely implemented, eliminating the need of site visits.
  • Fast fault locating: Remote management or packet capture software is not needed, shortening fault locating duration.
  • Accurate fault locating: Voice signaling tracing can be performed based on fault symptoms.
  • Intelligent fault locating: Intelligently associates with the tracked tasks, which lowers skills required for maintenance personnel and simplifies operations.
  • High security and reliability: The obtained signaling file does not contain any user privacy, such as the dialed telephone number, name, SMS, and FSK.

Networking Applications

Figure 1-149 shows the networking of signaling tracing.

Figure 1-149 Networking of signaling tracing

Signaling tracing takes effect on signaling exchanged between the IMS and OLT. The O&M engineer obtains the traced signaling by telnetting to the OLT from the PC.

Figure 1-150 shows the process of obtaining voice signaling.

Figure 1-150 Process of obtaining voice signaling

  1. The O&M engineer telnets to the OLT from the PC and starts voice signaling tracing through the CLI.
  2. The OLT sends the obtained voice signaling to the specified PC.
  3. The O&M engineer stops obtaining voice signaling.

Working Principles

Figure 1-151 shows the application of authorized signaling tracing.

Figure 1-151 Application of authorized signaling tracing

After authorized signaling tracing is enabled:
  1. The OLT filters packets based on ports. The OLT captures the signaling packets only on the ports with signaling packet capturing enabled.
  2. The OLT filters out sensitive personal information, including phone numbers, names, short messages, FSK data, and DTMF data, from the captured signaling packets.
  3. The OLT encapsulates the signaling packets into UDP payloads in the format of "ETH header+IP header+UDP header+signaling" and sends the UDP payloads to the PC.
  4. The O&M engineer analyzes the obtained voice signaling and locates faults on the telnet terminal.


Perform the following to obtain the voice signaling to locate a voice service fault quickly.
  1. Run the diagnose command to enter diagnose mode from privilege mode or global config mode.
  2. Run the signal trace command to start a signaling tracing task.
  3. Run the undo signal trace command stop signaling tracing manually or the system stops signaling tracing automatically (after the preset signaling tracing duration expires).


After signaling tracing, run the display signal trace command to query the signaling tracing information about the current port.

Updated: 2019-02-22

Document ID: EDOC1100067358

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