Establish a framework for monitoring and improving the quality of service (QoS) for your phone system. Begin by collecting data on key performance indicators (KPIs) such as [Call Drop Rate], [Voice Quality], and [Latency] over the last [Time Period]. Analyze this data to identify patterns and areas for improvement. Based on your analysis, propose specific actions, such as upgrading network bandwidth, adjusting QoS priorities, or changing hardware configurations to improve service reliability.