When you say "ser client" I assume you're talking about creating a softphone in Delphi. If so you'll need a SIP library to handle the SIP messaging piece. I took a quick look on Google for a Delphi SIP VCL but didn't see any. Perhaps the Delphi JEDI group will evenutally have one. You may have luck using the GNU osip library http://www.gnu.org/software/osip/osip.html but this written in C so you'll still have to create the PASCAL headers manually. The RTP side of the SIP phone is another story since RTP is not really part the SIP proxy. Again, you may have luck using the GNU ccRTP code from http://www.gnu.org/software/ccrtp/ and like osip this is a C library that will need PASCAL headers. Cheers, Paul --- MAMADOU TOURE <kiss_ci2000(a)yahoo.fr> wrote: __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com