Abstract
This paper describes problems of the FAX transmission via modem as a part of VoIP service, and proposes the solutions of the problems on the theoretical and experimental bases. The characteristics of the VoIP network, compared with the PSTN (Public Switched Telephone Network), are analyzed and the requirements for FAX communication are studied. Three problems emerge as results of the analysis and the study: echo problem, wave shape reproduction problem, and dial timer problem. The three problems are confirmed by experiment, and the solutions are proposed, based on the analysis and the experiment.
