Hello Brijesh, The question could have been more specific. What are you looking at ? Installion instructions or uses of openser ? be more specific and am sure experts would point you in the right direction OpenSER is a SIP proxy. Very basically it can be used for SIP client registration with TLS transport layer security. Have you used SER before ? IF yes, its almost the same as SER with added TLS support IF not, Compile OpenSER with Mysql and with or without TLS support. Go through the readme file once you have unpacked the tar ball. Follow the instructions in the readme. If you have more specific doubts write again. Gruß, Pjothi On 2/20/06, Brijesh <brijesh.jadav(a)einfochips.com> wrote: