The various reports can be helpful tools for system planning, diagnosing system and subscriber problems, and for recognizing and diagnosing trends.
Feature Reports and Grade of Service
The Feature Daily Traffic and Feature Hourly Traffic reports each display two separate reports. These reports list session traffic or message traffic information for up to 32 consecutive days or 192 consecutive hours, respectively. The Maximum Average Voice Ports in Use: field and the Maximum Average MCAPI Sessions in Use: field are particularly important fields in the Feature Daily Traffic and Feature Hourly Traffic reports.
Important These reports play an important role in determining your system's grade of service (GOS). Among other uses, GOS is used in determining port requirements. Port requirements on the messaging system are based on the use of ports for all applications, including call answer, messaging, automated attendant, outcalling, and call delivery.
Definition of Grade of Service
GOS is a parameter that describes the delays in accessing a port on the messaging system. Ideally, it is recommended that enough ports be provided so that there is always a port available. However, this is not necessary since calls are queued in an automatic call distribution (ACD) group or hunt group until a port is available. This queuing is acceptable to subscribers as long as the delays are not too long.
GOS is defined as the fraction of calls that are queued for longer than 10% of the average holding time on the ports. For example, if the average holding time on an messaging system port is 100 seconds, a 0.05 GOS means that 5% of the calls will experience queueing delays of greater than 10 seconds. A 0.05 or lower GOS is generally recommended for the messaging system.
Determining Grade of Service
To determine the GOS on an installed messaging system, you must retrieve the average number of ports that are used during the busiest hour from the system traffic data. Retrieval can be done by locating the Maximum Average Ports in Use field on the Feature Daily Traffic screen. Calculate the average of this value over several days to get a reliable indicator.
Next, locate the number of ports on your system in the first column of the Port Capacity in Erlangs (Avg. Ports in Use) at Various GOS table. Look across the row until you find the number that is equal to or just larger than your Maximum Average Ports in Use value. The number at the top of the column is the GOS during the busiest hour.