Hi, I also do not understand we should we register to the onsip website.........but I finally decided to do it to get the document. I found it really user-perspective convenient and therefore many starting users will highly appreciate it as a getting started document. I just have a few comments: 1) in 1.2.3 Transactions, Dialogs and Sessions: SIP transactions: you should mention that retransmissions are also part of a transaction. 2) In 1.4: Understanding SIP and RTP: RTPC will not always use RTP port +1. Newer versions of SDP standards include a parameter to indicate the port of RTCP and therefore ALWAYS is not 100% certain (although almost always it will be true). 3) In 1.7 URI, R-URI, Branches: URI stands for Uniform Resource Identifier and not Uniform Resource Identificator. Request URI is not the URI present in the To: header field but the one present in the first line of the SIP request. I hope this remarks are right, Samuel. Unclassified. _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers