Hi All When I call from 1 Windows Messenger to another without Asterisk everything use to be fine but when asterisk is there as a Registrar a problem use to occur in many calls (With Canreinvite = Yes in SIP.CONF), Caller can hear the voice of the receiving side but the receiver cant be able hear the caller for about 5 to 10 seconds, conversation will become two way after 5 - 10 seconds but this problem is a big hurdle in proper establishment of a call. When i use sjphone instead of windows messenger i dont get this problem but i have to use RTC Client APIs. Thanks In Advance __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com