Hello, I have downloaded pjproject-1.8 and could create the signed symbian_ua.sisx file using default certificate signing. But while installing in Nokia E61 ,Installation fails around 90% of its completion stage. Some of my queries: 1)Is it require to get any authorize certificate from any provider ? 2)Tried installing some other sample application like Audio proxy Server or VoIP Audio Service API , But failed during installation. Is the certificate signing is mandatory for any sis file installation? 3)Kindly provide me some valid steps/keys to install the application in device. Regards, Senthil kumar V Mobile: +919500066466 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20101101/5ff1c6f6/attachment.html>