Hi Benny, we are trying to make new application usign pjsip stack. As the registration is done perfectly. But when we are trying to make a call we are getting an error as status: 400 From_tag is requried. how to rectify this problem. and what we have to do to solve this problem. so that our call should work properly. please guide me how to solve this problem. waiting for ur guidence. As i am sending the marked capture packet information of that error as an attachment. please check out this once. --------------------------------- Never miss a thing. Make Yahoo your homepage. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080102/20615cdf/attachment.html -------------- next part -------------- A non-text attachment was scrubbed... Name: call.pcap Type: application/octet-stream Size: 498 bytes Desc: 408635117-call.pcap Url : http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080102/20615cdf/attachment.obj