ExecutiveSummaryObjectiveTocreateanopensourcetestbedforvalidatingtheendtoendVOIPcallsoriginatingorterminatingat3G/4GmobilenetworkforusecaseslikePSTN-IMSandIMS-PSTNcallflows.•Conformancetothe3GPPIMSstandardsusingopensourceelementswhichcanprovideadvantageslikeStandardconformanc