Hi again, As Casey said, I tried the Asterisk configuration (like I did before) and asterisk didn't reply correctly. My problem is that my SER's users can't make calls to Asterisk's users. In SER's configuration, I forward invite packets to Asterisk, and it really comes!. I dumped packets being sent, and found out that Asterisk replies with a "Not Found" error to SER, and this the thing that Client (SER's client) receives. I also captured an Asterisk's authorized user's invite packet for a specified calee, and the two "To" URIs are the same. (The one being sent from SER's user and the one from Asterisk's user). It seems registering Asterisk to SER is not sifficient to make SER authorized to Asterisk.Can anyone help me? Thank you. To Paul: I read the "Getting Started" document, but couldn't find anything related to registering SER to Asterisk. (Seems the section is still under construction) By the way, thanks to Casey and Paul. K. Aasaraai _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers