<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>Hello,</div><div>I have the following topology. </div><div>Kamailio as SIP Proxy and Asterisk as B2BUA. In Kamailio I use rtpproxy for NAT users.</div><div>The problem that I have is the following:</div><div>-When the CSipSimple is registered the first call is always unsuccesfull. The following calls are always successful. If the application remains idle for a while the next call is unsuccessful again. From traces I saw that <span style="font-size: 12pt;">everything is OK </span><span style="font-size: 12pt;">in signaling part.</span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal;"><span style="font-size: 12pt;">-When I try with Zoiper and 3CX I have 1/20 successful calls.</span></div><div
style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal;"><span style="font-size: 12pt;"><br></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal;"><span style="font-size: 12pt;">In any case from Asterisk side these calls can be seen as active but no media.</span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal;"><span style="font-size: 12pt;"><br></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal;">Thanx,</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times,
serif; background-color: transparent; font-style: normal;">Theo</div></div></body></html>