In these days, smartphones, such as iPhone, android phone, and windows phone, have spread all over the world, and thus mobile IP telephone services using WLAN as typified by Skype, are quite popular among the users. It, however, brings heavy traffic load in WLANs, and then deteriorates the realtime voice communication quality due to the packet delays and packet losses. In this paper, a dynamic packet control scheme based on Factor R, which is standardized in ITU-T G.107 as an objective voice quality index, will be proposed. In addition, the effectiveness of the proposed method under the environment where the network traffic varies will be discussed.%近年,iPhone，android phone,Windows phoneなどのスマートフォンが普及し，Skypeに代表されるWLANを用いたモバイルIP電話サービスの利用者が増加している．しかしながら，WLANトラヒックの増加によってパケット遅延およびパケットロスが発生するため，リアルタイム音声品質の劣化が問題となっている．本論文では，音声品質を客観的に示すR値（ITU-T G.107勧告による）を指標とした動的パケット制御方式を提案し，トラヒックが変化する環境における本提案の有効性について論じる．
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