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CSFR (Call Setup Failure Rate)

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Introduction:

Call Setup Failure Rate (CSFR) is a crucial performance indicator that measures the percentage of failed call setup attempts in a telecommunications network. It is an important metric that helps network operators assess the quality and reliability of their network, as well as identify and resolve any issues that may be causing call failures. In this article, we will explain CSFR in detail, including its significance, calculation methods, and how it is used in telecommunications network management.

Significance of CSFR:

CSFR is a critical metric for telecommunications network operators because it directly impacts customer satisfaction and revenue. Call setup failures can cause frustration among customers, leading to complaints and potential churn. Additionally, call setup failures can result in revenue loss for network operators, as customers may choose to use alternative communication methods or switch to a competitor's network. Therefore, network operators strive to keep CSFR as low as possible to ensure customer satisfaction and revenue retention.

Calculation Methods:

The CSFR is calculated as the number of failed call setup attempts divided by the total number of call setup attempts over a specific period, usually measured in minutes or hours. For example, if a network had 100 call setup attempts over an hour and 5 of those calls failed to connect, the CSFR for that hour would be 5%.

There are different ways to calculate CSFR depending on the type of call failure being measured. Some common methods include:

  1. Busy Call Failures: This occurs when the called party's line is busy and cannot accept incoming calls. To calculate the CSFR for busy call failures, the number of busy signals received during a specific period is divided by the total number of call setup attempts during that period.
  2. No Answer Call Failures: This occurs when the called party does not answer the phone within a certain time frame. To calculate the CSFR for no answer call failures, the number of unanswered calls during a specific period is divided by the total number of call setup attempts during that period.
  3. Dropped Call Failures: This occurs when a call is terminated before it is completed due to a network issue. To calculate the CSFR for dropped call failures, the number of dropped calls during a specific period is divided by the total number of call setup attempts during that period.
  4. Network Congestion Call Failures: This occurs when there is not enough network capacity to support all the incoming call requests. To calculate the CSFR for network congestion call failures, the number of calls that could not be completed due to network congestion during a specific period is divided by the total number of call setup attempts during that period.

CSFR in Telecommunications Network Management:

CSFR is a key performance indicator in telecommunications network management because it provides valuable insights into network performance and customer experience. A high CSFR indicates that there are issues with the network that need to be addressed, such as insufficient network capacity or poor call routing. Network operators can use CSFR data to identify the root cause of call failures and take corrective actions to improve network performance.

CSFR data can also be used to optimize network capacity by identifying high traffic areas and adjusting network resources accordingly. By doing so, network operators can prevent network congestion and reduce call setup failures, improving overall customer satisfaction and revenue retention.

CSFR data is often monitored in real-time using network management tools and software. These tools can provide network operators with alerts and notifications when CSFR exceeds a certain threshold, enabling them to quickly identify and resolve any issues that may be causing call failures.

Conclusion:

Call Setup Failure Rate (CSFR) is a critical performance metric in telecommunications network management. It measures the percentage of failed call setup attempts in a network and provides valuable insights into network performance and customer experience. Network operators can use CSFR data to identify the root cause of call failures and take corrective actions to improve network performance, optimize network capacity, and prevent revenue loss due to customer dissatisfaction and churn.

To achieve low CSFR, network operators must continuously monitor their network performance and invest in infrastructure upgrades to meet the increasing demand for communication services. Additionally, they must ensure that their network is properly maintained and configured to deliver high-quality and reliable service to customers.