On Tue, Jan 11, 2011 at 10:52 PM, Aidan Gauland <[email protected]> wrote: > Does anyone know of a good introduction to SIP for the end-user?
No, but ... SIP is not VoIP. VoIP involves other protocols as well as SIP, generally RTP. So searching for "SIP" won't explain VoIP to you ... http://en.wikipedia.org/wiki/Voice_over_IP may help? SIP provides the control connection between endpoints, and as Derek says this is significantly easier if that is a service rather than an end-user ... RTP (http://en.wikipedia.org/wiki/Real-time_Transport_Protocol) is commonly used as the mechanism for the actual voice data to flow between VoIP devices. Just like the old FTP control+data connections, SIP tries to tell the endpoints what the RTP connection is going to look like, and NAT firewalls break this enthusiastically. STUN (http://en.wikipedia.org/wiki/Session_Traversal_Utilities_for_NAT) tries to help fix this. For testing/playing, http://2talk.co.nz/ provide a decent service for free, and a decent paid service for talking to the old world of PSTN, too. -jim _______________________________________________ Linux-users mailing list [email protected] http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
