▁establish ▁a ▁trust ▁relationship ▁with ▁the ▁other ▁side . ▁If ▁you ▁use ▁a ▁trust ed ▁intermediate ▁for ▁this , ▁the ▁call ▁setup ▁delay ▁will ▁significantly ▁increase , ▁which ▁makes ▁applications ▁like ▁push - to - t alk ▁difficult . ▁If ▁you ▁do ▁this ▁peer - to - pe er , ▁it ▁might ▁be ▁difficult ▁for ▁you ▁to ▁identify ▁the ▁other ▁side . ▁For ▁example , ▁your ▁operator ▁might ▁implement ▁a ▁B 2 BU A ▁architecture ▁and ▁play ▁the ▁role ▁of ▁the ▁other ▁side , ▁so ▁that ▁you ▁still ▁don ' t ▁have ▁end - to - end ▁security . ▁Ne wer , ▁modern ▁protocol s , ▁like ▁Z R TP , ▁offer ▁end - to - end ▁encryption ▁for ▁S IP / R TP ▁calls . ▁ ▁See ▁also ▁M I KEY ▁key ▁exchange ▁method ▁Z R TP ▁end - to - end ▁key ▁exchange ▁proposal ▁D T LS - SR TP ▁end - to - end ▁key ▁exchange ▁I ET F ▁standard ▁ ▁External ▁links ▁ ▁Pres entation ▁about ▁different ▁key ▁exchange ▁methods ▁( Microsoft ▁Power Point ▁format .) ▁ ▁Category : Internet ▁protocol s <0x0A> </s> ▁L ư ơ ng ▁V ă n ▁ Đ ư ợ c ▁Em ▁( born ▁ 1 9 8 5 ▁in ▁H ồ ng ▁Ng ự ▁District , ▁ Đ ồ ng ▁Th á p ▁Province ) ▁is ▁Vietnam ese ▁footballer ▁who ▁plays ▁for ▁the ▁ Đ ồ ng ▁Th á p . ▁He ▁was ▁called ▁to ▁Vietnam ▁national ▁football ▁team ▁ ▁References ▁ ▁External