If you want 2 NATed devices to talk to each other, you MUST use an RTP proxy (except you want to manually configure the NAT router of every participant). Sessions between one public and one NATed client might work depending on the used SIP applications. Therefore, using an RTP proxy as soon at least one client is behind NAT is suggested! It's very simple, take a look at the config script at: http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/sip_router/etc/nathelper.cfg?… This will show you how to test if user agents are behind a NAT, how to rewrite the SIP messages and how to integrate the RTP proxy. Note: NAT traversal using RTP proxies and the nathelper module works only if the SIP client is symmetric (=sending and receiving on the same port, SIP and RTP). regards, Klaus -----Original Message----- From: Pablo Murillo [mailto:ser@rednet.com.ar] Sent: Thu 11.12.2003 21:20 To: serusers(a)lists.iptel.org Cc: Subject: [Serusers] Totally lost! proxies, firewalls, gateways, etc, etc,etc ... Hi I'm totally lost I have ser working very well (at least, I think so), with ans_machine (sems), varius exec_dset, numbering, etc, etc, etcBut I Don't know (or found) how to solve the "connectios" troubles For example: Two devices (hard/soft phone) with public IP, NO PROBLEM, works OK On device with public, one with private IP, works some times, NOT allways Two device with private IP, never work :( I know where is the problem (IPs), but I don't know where to find a "soft" solution or a "hard" solution, NOT to expensive Stun server Vovida: I don't like product without docs Some knows other STUN server ? RTP_proxy: I can't understand how it works :( I tested with nat, but I can't understand how it's work For example, how can I choose who will need to use nat helper and who not ? I don't know what other solutions are there Ideas ? Thanks in advance Pablo Murillo _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers