Abstract
An Internetworking Function (IWF) carrying VBR voice traffic between N-ISDN and B-ISDN networks will be considered. Based on the way the partially filled cells problem is addressed, two techniques governing the operation of the IWF will be proposed. In the first technique, bit stuffing will be considered, while in the second, delaying these unfilled cells will be suggested. It is assumed that in both cases, speech silence detection is employed. As an evaluation measure, the bandwidth utilization, the cell loss, the percentage of stuffing, and the delay performance will be computed. Results will be then presented and analyzed, followed by conclusions and suggestions.