Hi Chanduv, I am using pjsip in my project as sip stack. and it seems to work well. I do like this in my project: In latest mail i mention that. I initialize the callback fucntion in SipUaProfile.cfg.cb.* before use SipUaProfile as the first parameter to invoke pjsip_init(). there is a on_incoming_call in SipUaProfile.cfg.cb.*. SipUaProfile.cfg.cb.on_incoming_call = SipUaOnIncomingCall; It is used to notify you that there is a INVITE message received. in your on_incoming_call function.You should add some action. And Remeber that you should reply a 180 "Ring" to the caller by call pjsua_call_answer() function. I am afraid that you can not understand what i said.Since my english is poor.I am a chinese. Hope that's help. Regards Michael Liu Date: Fri, 27 Jun 2008 16:56:02 +0800From: chandu73@gmail.comTo: pjsip at lists.pjsip.orgSubject: Re: How the appication identifies Incoming Call Hi Michael Liu, Thanks for quick reply. actually i prepared one simple user interface in VC++ MFC by making use of pjsip stack. my application contains one dialpad, textbox ,call, hang answer, register unregister buttons. now i completed Reg, UnReg, Call, Hang, Answer , fuctionalities and working well ,but my problem is when i get an incoming Call, i want my application to show some Notification. if i blindly click the answer button i can able to talk.but i wish to do some notification or Ringing do u know how to fix the problem, any small idea is also appreciated . Thanks Chanduv _________________________________________________________________ MSN ???????????????????? http://cn.msn.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080627/1dd92b65/attachment.html