QoS Analysis on VoIP with VPN using SSL and L2TP IPSec Method

This research background began with the VoIP (Voice over Internet Protocol) service which allows to share information, communicate, and become a supporting priority part of the WFH (Work from Home) scheme. VoIP requires QoS (Quality of Service) because it is very sensitive to loss and delay of information packets. The novelty of this research is to compare the performance generated on several VPN security system mechanisms that use the L2TP IPSEC (Layer 2 Tunnelling Protocol Security) and SSL (Secure Socket Layer) methods. The purpose of this research is to obtain a VoIP security system mechanism and analyze delay, jitter, throughput, and packet loss as well as MOS (Mean Opinion Score) measurements. This research is expected to produce a model of best practice of applying QoS VoIP to network security systems The proposed research method is qualitative and objective studies. This research resulted in VoIP performance with an average delay on Forticlient SSL VPN of 7,804 ms while the average delay on L2TP IPSEC VPN was 9,787 ms and the average for forticlient SSL VPN jitter was 7,804 ms while the average jitter for L2TP IPSEC VPN was 9,786 ms. These results show that the SSL method's VoIP performance is better than the L2TP IPSec method, and jitter shows the L2TP IPSec method is better than the SSL method.