Hello, I'm currently using OpenSER as REGISTER server and Asterisk for the call routing. Do i need the OpenSER nathelper module if i want to offer (mostly) automatic NAT traversal to my users or does Asterisk have the same functionality? It seems that the nathelper module should be able to automatically traverse any NAT as long as the User-Agents use symmetric RTP. Further it is possible (in the ser.cfg) to automatically detect if the use of nathelper is needed for a specific call. Is this also possible with Asterisk? I found the options 'canreinvite' and 'nat' in the sip.conf, but I can't find any information about what behaviour the 'nat' option does change. Further I don't want to set 'canreinvite' globally to 'no' as I don't want to proxy the RTP stream if this isn't needed. Should I use Asterisk for this task - or is nathelper the better option? /gst -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part Url : http://lists.digium.com/pipermail/asterisk-users/attachments/20050716/40d5d55c/attachment.pgp