Hi Users...... A doubt For me in Codec.... I'm Using openSER and RTPProxy openser didn't take the Media tranmmision , it transmmit to RTPproxy or mediaproxy. Media(voice) taking place in RTP proxy... UA1 using the G729 codec -------> openser server -------------------> UA2 using G711u for above case it will not generate the porper handshanking............ But RTP Proxy may has transmiits the media , because it has codecs in ( media proxy or rtpproxy) For a realtime producttion, UAs may having the differnet codecs. plz resolve my doubt..... -- Thanks and Regards with cheers Sunkara Ravi Prakash (Voip Developer) Hyperion Technology www.hyperion-tech.com +91-9985077535