Direct Distance Dialing: Call Completion and Customer Retrial Behavior
1980; Institute of Electrical and Electronics Engineers; Volume: 59; Issue: 3 Linguagem: Inglês
10.1002/j.1538-7305.1980.tb03009.x
ISSN2376-7154
Autores Tópico(s)Mobile Agent-Based Network Management
ResumoMost customers placing a direct-distance-dialing (DDD) call in the United States are able to complete the call on the first attempt. However, it is reasonable to expect that the probability of an initial completion will be less than 1. When an initial attempt fails to complete, a customer may decide to abandon his desired telephone connection or to make one or more retrials. In general, a sequence of one or more attempts may be initiated by a customer in an effort to establish the desired connection. A study of DDD call completion and retrials is important to provide an overall characterization of network performance and customer behavior in setting up customers' desired telephone connections. A survey adopting a two-stage stratified sampling plan was undertaken to obtain DDD retrial statistics. Data associated with sampled DDD calls that were originated from one of 890 switching entities in the Bell System network were collected for a period of one week. The basic DDD retrial results reported here are initial attempt disposition probabilities, retrial probabilities, number of additional attempts, ultimate success probabilities, and distribution functions for retrial intervals following different types of incomplete initial attempts. Results of subclass analyses of retrial statistics by originating and terminating classes of service (residence and business) are also presented. Results obtained in this study are useful in many network planning applications. An application of significant importance is provision of a tool to evaluate the revenue and cost impact of call completion improvement programs. A technique to analyze the revenue and cost impact is outlined in the paper.
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